Commit message: avformat/mov: Check count sums in build_open_gop_key_points()

Fixes: ffmpeg.md
Fixes: Out of array access
Fixes: CVE-2022-2566

Found-by: Andy Nguyen <theflow@google.com>
Found-by: 3pvd <3pvd@google.com>
Reviewed-by: Andy Nguyen <theflow@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
CVE: None
CWE: CWE-703
Vulnerability description: None

Project: FFmpeg
File: mov.c

static int mov_read_coll(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVStreamContext *sc;
    int version;

    if (c->fc->nb_streams < 1)
        return AVERROR_INVALIDDATA;

    sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;

    if (atom.size < 5) {
        av_log(c->fc, AV_LOG_ERROR, "Empty Content Light Level box\n");
        return AVERROR_INVALIDDATA;
    }

    version = avio_r8(pb);
    if (version) {
        av_log(c->fc, AV_LOG_WARNING, "Unsupported Content Light Level box version %d\n", version);
        return 0;
    }
    avio_skip(pb, 3); /* flags */

    if (sc->coll){
        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicate COLL\n");
        return 0;
    }

    sc->coll = av_content_light_metadata_alloc(&sc->coll_size);
    if (!sc->coll)
        return AVERROR(ENOMEM);

    sc->coll->MaxCLL  = avio_rb16(pb);
    sc->coll->MaxFALL = avio_rb16(pb);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_clli(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVStreamContext *sc;

    if (c->fc->nb_streams < 1)
        return AVERROR_INVALIDDATA;

    sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;

    if (atom.size < 4) {
        av_log(c->fc, AV_LOG_ERROR, "Empty Content Light Level Info box\n");
        return AVERROR_INVALIDDATA;
    }

    if (sc->coll){
        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicate CLLI/COLL\n");
        return 0;
    }

    sc->coll = av_content_light_metadata_alloc(&sc->coll_size);
    if (!sc->coll)
        return AVERROR(ENOMEM);

    sc->coll->MaxCLL  = avio_rb16(pb);
    sc->coll->MaxFALL = avio_rb16(pb);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int64_t total_size = 0;
    MOVAtom a;
    int i;

    if (c->atom_depth > 10) {
        av_log(c->fc, AV_LOG_ERROR, "Atoms too deeply nested\n");
        return AVERROR_INVALIDDATA;
    }
    c->atom_depth ++;

    if (atom.size < 0)
        atom.size = INT64_MAX;
    while (total_size <= atom.size - 8) {
        int (*parse)(MOVContext*, AVIOContext*, MOVAtom) = NULL;
        a.size = avio_rb32(pb);
        a.type = avio_rl32(pb);
        if (avio_feof(pb))
            break;
        if (((a.type == MKTAG('f','r','e','e') && c->moov_retry) ||
              a.type == MKTAG('h','o','o','v')) &&
            a.size >= 8 &&
            c->fc->strict_std_compliance < FF_COMPLIANCE_STRICT) {
                uint32_t type;
                avio_skip(pb, 4);
                type = avio_rl32(pb);
                if (avio_feof(pb))
                    break;
                avio_seek(pb, -8, SEEK_CUR);
                if (type == MKTAG('m','v','h','d') ||
                    type == MKTAG('c','m','o','v')) {
                    av_log(c->fc, AV_LOG_ERROR, "Detected moov in a free or hoov atom.\n");
                    a.type = MKTAG('m','o','o','v');
                }
        }
        if (atom.type != MKTAG('r','o','o','t') &&
            atom.type != MKTAG('m','o','o','v')) {
            if (a.type == MKTAG('t','r','a','k') ||
                a.type == MKTAG('m','d','a','t')) {
                av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n");
                avio_skip(pb, -8);
                c->atom_depth --;
                return 0;
            }
        }
        total_size += 8;
        if (a.size == 1 && total_size + 8 <= atom.size) { /* 64 bit extended size */
            a.size = avio_rb64(pb) - 8;
            total_size += 8;
        }
        av_log(c->fc, AV_LOG_TRACE, "type:'%s' parent:'%s' sz: %"PRId64" %"PRId64" %"PRId64"\n",
               av_fourcc2str(a.type), av_fourcc2str(atom.type), a.size, total_size, atom.size);
        if (a.size == 0) {
            a.size = atom.size - total_size + 8;
        }
        if (a.size < 0)
            break;
        a.size -= 8;
        if (a.size < 0)
            break;
        a.size = FFMIN(a.size, atom.size - total_size);

        for (i = 0; mov_default_parse_table[i].type; i++)
            if (mov_default_parse_table[i].type == a.type) {
                parse = mov_default_parse_table[i].parse;
                break;
            }

        // container is user data
        if (!parse && (atom.type == MKTAG('u','d','t','a') ||
                       atom.type == MKTAG('i','l','s','t')))
            parse = mov_read_udta_string;

        // Supports parsing the QuickTime Metadata Keys.
        // https://developer.apple.com/library/mac/documentation/QuickTime/QTFF/Metadata/Metadata.html
        if (!parse && c->found_hdlr_mdta &&
            atom.type == MKTAG('m','e','t','a') &&
            a.type == MKTAG('k','e','y','s') &&
            c->meta_keys_count == 0) {
            parse = mov_read_keys;
        }

        if (!parse) { /* skip leaf atoms data */
            avio_skip(pb, a.size);
        } else {
            int64_t start_pos = avio_tell(pb);
            int64_t left;
            int err = parse(c, pb, a);
            if (err < 0) {
                c->atom_depth --;
                return err;
            }
            if (c->found_moov && c->found_mdat && a.size <= INT64_MAX - start_pos &&
                ((!(pb->seekable & AVIO_SEEKABLE_NORMAL) || c->fc->flags & AVFMT_FLAG_IGNIDX || c->frag_index.complete) ||
                 start_pos + a.size == avio_size(pb))) {
                if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || c->fc->flags & AVFMT_FLAG_IGNIDX || c->frag_index.complete)
                    c->next_root_atom = start_pos + a.size;
                c->atom_depth --;
                return 0;
            }
            left = a.size - avio_tell(pb) + start_pos;
            if (left > 0) /* skip garbage at atom end */
                avio_skip(pb, left);
            else if (left < 0) {
                av_log(c->fc, AV_LOG_WARNING,
                       "overread end of atom '%s' by %"PRId64" bytes\n",
                       av_fourcc2str(a.type), -left);
                avio_seek(pb, left, SEEK_CUR);
            }
        }

        total_size += a.size;
    }

    if (total_size < atom.size && atom.size < 0x7ffff)
        avio_skip(pb, atom.size - total_size);

    c->atom_depth --;
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MOVContext *mov = s->priv_data;
    MOVStreamContext *sc;
    AVIndexEntry *sample;
    AVStream *st = NULL;
    int64_t current_index;
    int ret;
    mov->fc = s;
 retry:
    sample = mov_find_next_sample(s, &st);
    if (!sample || (mov->next_root_atom && sample->pos > mov->next_root_atom)) {
        if (!mov->next_root_atom)
            return AVERROR_EOF;
        if ((ret = mov_switch_root(s, mov->next_root_atom, -1)) < 0)
            return ret;
        goto retry;
    }
    sc = st->priv_data;
    /* must be done just before reading, to avoid infinite loop on sample */
    current_index = sc->current_index;
    mov_current_sample_inc(sc);

    if (mov->next_root_atom) {
        sample->pos = FFMIN(sample->pos, mov->next_root_atom);
        sample->size = FFMIN(sample->size, (mov->next_root_atom - sample->pos));
    }

    if (st->discard != AVDISCARD_ALL) {
        int64_t ret64 = avio_seek(sc->pb, sample->pos, SEEK_SET);
        if (ret64 != sample->pos) {
            av_log(mov->fc, AV_LOG_ERROR, "stream %d, offset 0x%"PRIx64": partial file\n",
                   sc->ffindex, sample->pos);
            if (should_retry(sc->pb, ret64)) {
                mov_current_sample_dec(sc);
            } else if (ret64 < 0) {
                return (int)ret64;
            }
            return AVERROR_INVALIDDATA;
        }

        if (st->discard == AVDISCARD_NONKEY && !(sample->flags & AVINDEX_KEYFRAME)) {
            av_log(mov->fc, AV_LOG_DEBUG, "Nonkey frame from stream %d discarded due to AVDISCARD_NONKEY\n", sc->ffindex);
            goto retry;
        }

        if (st->codecpar->codec_id == AV_CODEC_ID_EIA_608 && sample->size > 8)
            ret = get_eia608_packet(sc->pb, pkt, sample->size);
        else
            ret = av_get_packet(sc->pb, pkt, sample->size);
        if (ret < 0) {
            if (should_retry(sc->pb, ret)) {
                mov_current_sample_dec(sc);
            }
            return ret;
        }
#if CONFIG_DV_DEMUXER
        if (mov->dv_demux && sc->dv_audio_container) {
            ret = avpriv_dv_produce_packet(mov->dv_demux, pkt, pkt->data, pkt->size, pkt->pos);
            av_packet_unref(pkt);
            if (ret < 0)
                return ret;
            ret = avpriv_dv_get_packet(mov->dv_demux, pkt);
            if (ret < 0)
                return ret;
        }
#endif
        if (sc->has_palette) {
            uint8_t *pal;

            pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
            if (!pal) {
                av_log(mov->fc, AV_LOG_ERROR, "Cannot append palette to packet\n");
            } else {
                memcpy(pal, sc->palette, AVPALETTE_SIZE);
                sc->has_palette = 0;
            }
        }
        if (st->codecpar->codec_id == AV_CODEC_ID_MP3 && !ffstream(st)->need_parsing && pkt->size > 4) {
            if (ff_mpa_check_header(AV_RB32(pkt->data)) < 0)
                ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
        }
    }

    pkt->stream_index = sc->ffindex;
    pkt->dts = sample->timestamp;
    if (sample->flags & AVINDEX_DISCARD_FRAME) {
        pkt->flags |= AV_PKT_FLAG_DISCARD;
    }
    if (sc->ctts_data && sc->ctts_index < sc->ctts_count) {
        pkt->pts = pkt->dts + sc->dts_shift + sc->ctts_data[sc->ctts_index].duration;
        /* update ctts context */
        sc->ctts_sample++;
        if (sc->ctts_index < sc->ctts_count &&
            sc->ctts_data[sc->ctts_index].count == sc->ctts_sample) {
            sc->ctts_index++;
            sc->ctts_sample = 0;
        }
    } else {
        int64_t next_dts = (sc->current_sample < ffstream(st)->nb_index_entries) ?
            ffstream(st)->index_entries[sc->current_sample].timestamp : st->duration;

        if (next_dts >= pkt->dts)
            pkt->duration = next_dts - pkt->dts;
        pkt->pts = pkt->dts;
    }
    if (st->discard == AVDISCARD_ALL)
        goto retry;
    if (sc->sdtp_data && sc->current_sample <= sc->sdtp_count) {
        uint8_t sample_flags = sc->sdtp_data[sc->current_sample - 1];
        uint8_t sample_is_depended_on = (sample_flags >> 2) & 0x3;
        pkt->flags |= sample_is_depended_on == MOV_SAMPLE_DEPENDENCY_NO ? AV_PKT_FLAG_DISPOSABLE : 0;
    }
    pkt->flags |= sample->flags & AVINDEX_KEYFRAME ? AV_PKT_FLAG_KEY : 0;
    pkt->pos = sample->pos;

    /* Multiple stsd handling. */
    if (sc->stsc_data) {
        if (sc->stsc_data[sc->stsc_index].id > 0 &&
            sc->stsc_data[sc->stsc_index].id - 1 < sc->stsd_count &&
            sc->stsc_data[sc->stsc_index].id - 1 != sc->last_stsd_index) {
            ret = mov_change_extradata(sc, pkt);
            if (ret < 0)
                return ret;
        }

        /* Update the stsc index for the next sample */
        sc->stsc_sample++;
        if (mov_stsc_index_valid(sc->stsc_index, sc->stsc_count) &&
            mov_get_stsc_samples(sc, sc->stsc_index) == sc->stsc_sample) {
            sc->stsc_index++;
            sc->stsc_sample = 0;
        }
    }

    if (mov->aax_mode)
        aax_filter(pkt->data, pkt->size, mov);

    ret = cenc_filter(mov, st, sc, pkt, current_index);
    if (ret < 0) {
        return ret;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int i;
    int64_t creation_time;
    int version = avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    if (version == 1) {
        creation_time = avio_rb64(pb);
        avio_rb64(pb);
    } else {
        creation_time = avio_rb32(pb);
        avio_rb32(pb); /* modification time */
    }
    mov_metadata_creation_time(&c->fc->metadata, creation_time, c->fc);
    c->time_scale = avio_rb32(pb); /* time scale */
    if (c->time_scale <= 0) {
        av_log(c->fc, AV_LOG_ERROR, "Invalid mvhd time scale %d, defaulting to 1\n", c->time_scale);
        c->time_scale = 1;
    }
    av_log(c->fc, AV_LOG_TRACE, "time scale = %i\n", c->time_scale);

    c->duration = (version == 1) ? avio_rb64(pb) : avio_rb32(pb); /* duration */
    // set the AVFormatContext duration because the duration of individual tracks
    // may be inaccurate
    if (!c->trex_data)
        c->fc->duration = av_rescale(c->duration, AV_TIME_BASE, c->time_scale);
    avio_rb32(pb); /* preferred scale */

    avio_rb16(pb); /* preferred volume */

    avio_skip(pb, 10); /* reserved */

    /* movie display matrix, store it in main context and use it later on */
    for (i = 0; i < 3; i++) {
        c->movie_display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
        c->movie_display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
        c->movie_display_matrix[i][2] = avio_rb32(pb); //  2.30 fixed point
    }

    avio_rb32(pb); /* preview time */
    avio_rb32(pb); /* preview duration */
    avio_rb32(pb); /* poster time */
    avio_rb32(pb); /* selection time */
    avio_rb32(pb); /* selection duration */
    avio_rb32(pb); /* current time */
    avio_rb32(pb); /* next track ID */

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_tfdt(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVFragment *frag = &c->fragment;
    AVStream *st = NULL;
    MOVStreamContext *sc;
    int version, i;
    MOVFragmentStreamInfo * frag_stream_info;
    int64_t base_media_decode_time;

    for (i = 0; i < c->fc->nb_streams; i++) {
        if (c->fc->streams[i]->id == frag->track_id) {
            st = c->fc->streams[i];
            break;
        }
    }
    if (!st) {
        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding track id %u\n", frag->track_id);
        return 0;
    }
    sc = st->priv_data;
    if (sc->pseudo_stream_id + 1 != frag->stsd_id && sc->pseudo_stream_id != -1)
        return 0;
    version = avio_r8(pb);
    avio_rb24(pb); /* flags */
    if (version) {
        base_media_decode_time = avio_rb64(pb);
    } else {
        base_media_decode_time = avio_rb32(pb);
    }

    frag_stream_info = get_current_frag_stream_info(&c->frag_index);
    if (frag_stream_info)
        frag_stream_info->tfdt_dts = base_media_decode_time;
    sc->track_end = base_media_decode_time;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_skip_multiple_stsd(MOVContext *c, AVIOContext *pb,
                                  int codec_tag, int format,
                                  int64_t size)
{
    if (codec_tag &&
         (codec_tag != format &&
          // AVID 1:1 samples with differing data format and codec tag exist
          (codec_tag != AV_RL32("AV1x") || format != AV_RL32("AVup")) &&
          // prores is allowed to have differing data format and codec tag
          codec_tag != AV_RL32("apcn") && codec_tag != AV_RL32("apch") &&
          // so is dv (sigh)
          codec_tag != AV_RL32("dvpp") && codec_tag != AV_RL32("dvcp") &&
          (c->fc->video_codec_id ? ff_codec_get_id(ff_codec_movvideo_tags, format) != c->fc->video_codec_id
                                 : codec_tag != MKTAG('j','p','e','g')))) {
        /* Multiple fourcc, we skip JPEG. This is not correct, we should
         * export it as a separate AVStream but this needs a few changes
         * in the MOV demuxer, patch welcome. */

        av_log(c->fc, AV_LOG_WARNING, "multiple fourcc not supported\n");
        avio_skip(pb, size);
        return 1;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_sv3d(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    int size, version, layout;
    int32_t yaw, pitch, roll;
    uint32_t l = 0, t = 0, r = 0, b = 0;
    uint32_t tag, padding = 0;
    enum AVSphericalProjection projection;

    if (c->fc->nb_streams < 1)
        return 0;

    st = c->fc->streams[c->fc->nb_streams - 1];
    sc = st->priv_data;

    if (atom.size < 8) {
        av_log(c->fc, AV_LOG_ERROR, "Empty spherical video box\n");
        return AVERROR_INVALIDDATA;
    }

    size = avio_rb32(pb);
    if (size <= 12 || size > atom.size)
        return AVERROR_INVALIDDATA;

    tag = avio_rl32(pb);
    if (tag != MKTAG('s','v','h','d')) {
        av_log(c->fc, AV_LOG_ERROR, "Missing spherical video header\n");
        return 0;
    }
    version = avio_r8(pb);
    if (version != 0) {
        av_log(c->fc, AV_LOG_WARNING, "Unknown spherical version %d\n",
               version);
        return 0;
    }
    avio_skip(pb, 3); /* flags */
    avio_skip(pb, size - 12); /* metadata_source */

    size = avio_rb32(pb);
    if (size > atom.size)
        return AVERROR_INVALIDDATA;

    tag = avio_rl32(pb);
    if (tag != MKTAG('p','r','o','j')) {
        av_log(c->fc, AV_LOG_ERROR, "Missing projection box\n");
        return 0;
    }

    size = avio_rb32(pb);
    if (size > atom.size)
        return AVERROR_INVALIDDATA;

    tag = avio_rl32(pb);
    if (tag != MKTAG('p','r','h','d')) {
        av_log(c->fc, AV_LOG_ERROR, "Missing projection header box\n");
        return 0;
    }
    version = avio_r8(pb);
    if (version != 0) {
        av_log(c->fc, AV_LOG_WARNING, "Unknown spherical version %d\n",
               version);
        return 0;
    }
    avio_skip(pb, 3); /* flags */

    /* 16.16 fixed point */
    yaw   = avio_rb32(pb);
    pitch = avio_rb32(pb);
    roll  = avio_rb32(pb);

    size = avio_rb32(pb);
    if (size > atom.size)
        return AVERROR_INVALIDDATA;

    tag = avio_rl32(pb);
    version = avio_r8(pb);
    if (version != 0) {
        av_log(c->fc, AV_LOG_WARNING, "Unknown spherical version %d\n",
               version);
        return 0;
    }
    avio_skip(pb, 3); /* flags */
    switch (tag) {
    case MKTAG('c','b','m','p'):
        layout = avio_rb32(pb);
        if (layout) {
            av_log(c->fc, AV_LOG_WARNING,
                   "Unsupported cubemap layout %d\n", layout);
            return 0;
        }
        projection = AV_SPHERICAL_CUBEMAP;
        padding = avio_rb32(pb);
        break;
    case MKTAG('e','q','u','i'):
        t = avio_rb32(pb);
        b = avio_rb32(pb);
        l = avio_rb32(pb);
        r = avio_rb32(pb);

        if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
            av_log(c->fc, AV_LOG_ERROR,
                   "Invalid bounding rectangle coordinates "
                   "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n", l, t, r, b);
            return AVERROR_INVALIDDATA;
        }

        if (l || t || r || b)
            projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
        else
            projection = AV_SPHERICAL_EQUIRECTANGULAR;
        break;
    default:
        av_log(c->fc, AV_LOG_ERROR, "Unknown projection type: %s\n", av_fourcc2str(tag));
        return 0;
    }

    sc->spherical = av_spherical_alloc(&sc->spherical_size);
    if (!sc->spherical)
        return AVERROR(ENOMEM);

    sc->spherical->projection = projection;

    sc->spherical->yaw   = yaw;
    sc->spherical->pitch = pitch;
    sc->spherical->roll  = roll;

    sc->spherical->padding = padding;

    sc->spherical->bound_left   = l;
    sc->spherical->bound_top    = t;
    sc->spherical->bound_right  = r;
    sc->spherical->bound_bottom = b;

    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_update_dts_shift(MOVStreamContext *sc, int duration, void *logctx)
{
    if (duration < 0) {
        if (duration == INT_MIN) {
            av_log(logctx, AV_LOG_WARNING, "mov_update_dts_shift(): dts_shift set to %d\n", INT_MAX);
            duration++;
        }
        sc->dts_shift = FFMAX(sc->dts_shift, -duration);
    }
}

Project: FFmpeg
File: mov.c

static inline int mov_stsc_index_valid(unsigned int index, unsigned int count)
{
    return index < count - 1;
}

Project: FFmpeg
File: mov.c

static int mov_read_pssh(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVEncryptionInitInfo *info, *old_init_info;
    uint8_t **key_ids;
    AVStream *st;
    uint8_t *side_data, *extra_data, *old_side_data;
    size_t side_data_size, old_side_data_size;
    int ret = 0;
    unsigned int version, kid_count, extra_data_size, alloc_size = 0;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    version = avio_r8(pb); /* version */
    avio_rb24(pb);  /* flags */

    info = av_encryption_init_info_alloc(/* system_id_size */ 16, /* num_key_ids */ 0,
                                         /* key_id_size */ 16, /* data_size */ 0);
    if (!info)
        return AVERROR(ENOMEM);

    if ((ret = ffio_read_size(pb, info->system_id, 16)) < 0) {
        av_log(c->fc, AV_LOG_ERROR, "Failed to read the system id\n");
        goto finish;
    }

    if (version > 0) {
        kid_count = avio_rb32(pb);
        if (kid_count >= INT_MAX / sizeof(*key_ids)) {
            ret = AVERROR(ENOMEM);
            goto finish;
        }

        for (unsigned int i = 0; i < kid_count && !pb->eof_reached; i++) {
            unsigned int min_kid_count = FFMIN(FFMAX(i + 1, 1024), kid_count);
            key_ids = av_fast_realloc(info->key_ids, &alloc_size,
                                      min_kid_count * sizeof(*key_ids));
            if (!key_ids) {
                ret = AVERROR(ENOMEM);
                goto finish;
            }
            info->key_ids = key_ids;

            info->key_ids[i] = av_mallocz(16);
            if (!info->key_ids[i]) {
                ret = AVERROR(ENOMEM);
                goto finish;
            }
            info->num_key_ids = i + 1;

            if ((ret = ffio_read_size(pb, info->key_ids[i], 16)) < 0) {
                av_log(c->fc, AV_LOG_ERROR, "Failed to read the key id\n");
                goto finish;
            }
        }

        if (pb->eof_reached) {
            av_log(c->fc, AV_LOG_ERROR, "Hit EOF while reading pssh\n");
            ret = AVERROR_INVALIDDATA;
            goto finish;
        }
    }

    extra_data_size = avio_rb32(pb);
    ret = mov_try_read_block(pb, extra_data_size, &extra_data);
    if (ret < 0)
        goto finish;

    av_freep(&info->data);  // malloc(0) may still allocate something.
    info->data = extra_data;
    info->data_size = extra_data_size;

    // If there is existing initialization data, append to the list.
    old_side_data = av_stream_get_side_data(st, AV_PKT_DATA_ENCRYPTION_INIT_INFO, &old_side_data_size);
    if (old_side_data) {
        old_init_info = av_encryption_init_info_get_side_data(old_side_data, old_side_data_size);
        if (old_init_info) {
            // Append to the end of the list.
            for (AVEncryptionInitInfo *cur = old_init_info;; cur = cur->next) {
                if (!cur->next) {
                    cur->next = info;
                    break;
                }
            }
            info = old_init_info;
        } else {
            // Assume existing side-data will be valid, so the only error we could get is OOM.
            ret = AVERROR(ENOMEM);
            goto finish;
        }
    }

    side_data = av_encryption_init_info_add_side_data(info, &side_data_size);
    if (!side_data) {
        ret = AVERROR(ENOMEM);
        goto finish;
    }
    ret = av_stream_add_side_data(st, AV_PKT_DATA_ENCRYPTION_INIT_INFO,
                                  side_data, side_data_size);
    if (ret < 0)
        av_free(side_data);

finish:
    av_encryption_init_info_free(info);
    return ret;
}

Project: FFmpeg
File: mov.c

static int mov_read_st3d(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    enum AVStereo3DType type;
    int mode;

    if (c->fc->nb_streams < 1)
        return 0;

    st = c->fc->streams[c->fc->nb_streams - 1];
    sc = st->priv_data;

    if (atom.size < 5) {
        av_log(c->fc, AV_LOG_ERROR, "Empty stereoscopic video box\n");
        return AVERROR_INVALIDDATA;
    }

    if (sc->stereo3d)
        return AVERROR_INVALIDDATA;

    avio_skip(pb, 4); /* version + flags */

    mode = avio_r8(pb);
    switch (mode) {
    case 0:
        type = AV_STEREO3D_2D;
        break;
    case 1:
        type = AV_STEREO3D_TOPBOTTOM;
        break;
    case 2:
        type = AV_STEREO3D_SIDEBYSIDE;
        break;
    default:
        av_log(c->fc, AV_LOG_WARNING, "Unknown st3d mode value %d\n", mode);
        return 0;
    }

    sc->stereo3d = av_stereo3d_alloc();
    if (!sc->stereo3d)
        return AVERROR(ENOMEM);

    sc->stereo3d->type = type;
    return 0;
}

Project: FFmpeg
File: mov.c

int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)
{
    AVStream *st;
    MOVStreamContext *sc;
    int pseudo_stream_id;

    av_assert0 (c->fc->nb_streams >= 1);
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    for (pseudo_stream_id = 0;
         pseudo_stream_id < entries && !pb->eof_reached;
         pseudo_stream_id++) {
        //Parsing Sample description table
        enum AVCodecID id;
        int ret, dref_id = 1;
        MOVAtom a = { AV_RL32("stsd") };
        int64_t start_pos = avio_tell(pb);
        int64_t size    = avio_rb32(pb); /* size */
        uint32_t format = avio_rl32(pb); /* data format */

        if (size >= 16) {
            avio_rb32(pb); /* reserved */
            avio_rb16(pb); /* reserved */
            dref_id = avio_rb16(pb);
        } else if (size <= 7) {
            av_log(c->fc, AV_LOG_ERROR,
                   "invalid size %"PRId64" in stsd\n", size);
            return AVERROR_INVALIDDATA;
        }

        if (mov_skip_multiple_stsd(c, pb, st->codecpar->codec_tag, format,
                                   size - (avio_tell(pb) - start_pos))) {
            sc->stsd_count++;
            continue;
        }

        sc->pseudo_stream_id = st->codecpar->codec_tag ? -1 : pseudo_stream_id;
        sc->dref_id= dref_id;
        sc->format = format;

        id = mov_codec_id(st, format);

        av_log(c->fc, AV_LOG_TRACE,
               "size=%"PRId64" 4CC=%s codec_type=%d\n", size,
               av_fourcc2str(format), st->codecpar->codec_type);

        st->codecpar->codec_id = id;
        if (st->codecpar->codec_type==AVMEDIA_TYPE_VIDEO) {
            mov_parse_stsd_video(c, pb, st, sc);
        } else if (st->codecpar->codec_type==AVMEDIA_TYPE_AUDIO) {
            mov_parse_stsd_audio(c, pb, st, sc);
            if (st->codecpar->sample_rate < 0) {
                av_log(c->fc, AV_LOG_ERROR, "Invalid sample rate %d\n", st->codecpar->sample_rate);
                return AVERROR_INVALIDDATA;
            }
            if (st->codecpar->ch_layout.nb_channels < 0) {
                av_log(c->fc, AV_LOG_ERROR, "Invalid channels %d\n", st->codecpar->ch_layout.nb_channels);
                return AVERROR_INVALIDDATA;
            }
        } else if (st->codecpar->codec_type==AVMEDIA_TYPE_SUBTITLE){
            mov_parse_stsd_subtitle(c, pb, st, sc,
                                    size - (avio_tell(pb) - start_pos));
        } else {
            ret = mov_parse_stsd_data(c, pb, st, sc,
                                      size - (avio_tell(pb) - start_pos));
            if (ret < 0)
                return ret;
        }
        /* this will read extra atoms at the end (wave, alac, damr, avcC, hvcC, SMI ...) */
        a.size = size - (avio_tell(pb) - start_pos);
        if (a.size > 8) {
            if ((ret = mov_read_default(c, pb, a)) < 0)
                return ret;
        } else if (a.size > 0)
            avio_skip(pb, a.size);

        if (sc->extradata && st->codecpar->extradata) {
            int extra_size = st->codecpar->extradata_size;

            /* Move the current stream extradata to the stream context one. */
            sc->extradata_size[pseudo_stream_id] = extra_size;
            sc->extradata[pseudo_stream_id] = st->codecpar->extradata;
            st->codecpar->extradata      = NULL;
            st->codecpar->extradata_size = 0;
        }
        sc->stsd_count++;
    }

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STSD atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    // Set by mov_read_tfhd(). mov_read_trun() will reject files missing tfhd.
    c->fragment.found_tfhd = 0;

    if (!c->has_looked_for_mfra && c->use_mfra_for > 0) {
        c->has_looked_for_mfra = 1;
        if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
            int ret;
            av_log(c->fc, AV_LOG_VERBOSE, "stream has moof boxes, will look "
                    "for a mfra\n");
            if ((ret = mov_read_mfra(c, pb)) < 0) {
                av_log(c->fc, AV_LOG_VERBOSE, "found a moof box but failed to "
                        "read the mfra (may be a live ismv)\n");
            }
        } else {
            av_log(c->fc, AV_LOG_VERBOSE, "found a moof box but stream is not "
                    "seekable, can not look for mfra\n");
        }
    }
    c->fragment.moof_offset = c->fragment.implicit_offset = avio_tell(pb) - 8;
    av_log(c->fc, AV_LOG_TRACE, "moof offset %"PRIx64"\n", c->fragment.moof_offset);
    c->frag_index.current = update_frag_index(c, c->fragment.moof_offset);
    return mov_read_default(c, pb, atom);
}

Project: FFmpeg
File: mov.c

static void set_last_stream_little_endian(AVFormatContext *fc)
{
    AVStream *st;

    if (fc->nb_streams < 1)
        return;
    st = fc->streams[fc->nb_streams-1];

    switch (st->codecpar->codec_id) {
    case AV_CODEC_ID_PCM_S16BE:
        st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
        break;
    case AV_CODEC_ID_PCM_S24BE:
        st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE;
        break;
    case AV_CODEC_ID_PCM_S32BE:
        st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE;
        break;
    case AV_CODEC_ID_PCM_F32BE:
        st->codecpar->codec_id = AV_CODEC_ID_PCM_F32LE;
        break;
    case AV_CODEC_ID_PCM_F64BE:
        st->codecpar->codec_id = AV_CODEC_ID_PCM_F64LE;
        break;
    default:
        break;
    }
}

Project: FFmpeg
File: mov.c

static int mov_read_tenc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int version, pattern, is_protected, iv_size;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    if (sc->pseudo_stream_id != 0) {
        av_log(c->fc, AV_LOG_ERROR, "tenc atom are only supported in first sample descriptor\n");
        return AVERROR_PATCHWELCOME;
    }

    if (!sc->cenc.default_encrypted_sample) {
        sc->cenc.default_encrypted_sample = av_encryption_info_alloc(0, 16, 16);
        if (!sc->cenc.default_encrypted_sample) {
            return AVERROR(ENOMEM);
        }
    }

    if (atom.size < 20)
        return AVERROR_INVALIDDATA;

    version = avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    avio_r8(pb); /* reserved */
    pattern = avio_r8(pb);

    if (version > 0) {
        sc->cenc.default_encrypted_sample->crypt_byte_block = pattern >> 4;
        sc->cenc.default_encrypted_sample->skip_byte_block = pattern & 0xf;
    }

    is_protected = avio_r8(pb);
    if (is_protected && !sc->cenc.encryption_index) {
        // The whole stream should be by-default encrypted.
        sc->cenc.encryption_index = av_mallocz(sizeof(MOVEncryptionIndex));
        if (!sc->cenc.encryption_index)
            return AVERROR(ENOMEM);
    }
    sc->cenc.per_sample_iv_size = avio_r8(pb);
    if (sc->cenc.per_sample_iv_size != 0 && sc->cenc.per_sample_iv_size != 8 &&
        sc->cenc.per_sample_iv_size != 16) {
        av_log(c->fc, AV_LOG_ERROR, "invalid per-sample IV size value\n");
        return AVERROR_INVALIDDATA;
    }
    if (avio_read(pb, sc->cenc.default_encrypted_sample->key_id, 16) != 16) {
        av_log(c->fc, AV_LOG_ERROR, "failed to read the default key ID\n");
        return AVERROR_INVALIDDATA;
    }

    if (is_protected && !sc->cenc.per_sample_iv_size) {
        iv_size = avio_r8(pb);
        if (iv_size != 8 && iv_size != 16) {
            av_log(c->fc, AV_LOG_ERROR, "invalid default_constant_IV_size in tenc atom\n");
            return AVERROR_INVALIDDATA;
        }

        if (avio_read(pb, sc->cenc.default_encrypted_sample->iv, iv_size) != iv_size) {
            av_log(c->fc, AV_LOG_ERROR, "failed to read the default IV\n");
            return AVERROR_INVALIDDATA;
        }
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int read_tfra(MOVContext *mov, AVIOContext *f)
{
    int version, fieldlength, i, j;
    int64_t pos = avio_tell(f);
    uint32_t size = avio_rb32(f);
    unsigned track_id, item_count;

    if (avio_rb32(f) != MKBETAG('t', 'f', 'r', 'a')) {
        return 1;
    }
    av_log(mov->fc, AV_LOG_VERBOSE, "found tfra\n");

    version = avio_r8(f);
    avio_rb24(f);
    track_id = avio_rb32(f);
    fieldlength = avio_rb32(f);
    item_count = avio_rb32(f);
    for (i = 0; i < item_count; i++) {
        int64_t time, offset;
        int index;
        MOVFragmentStreamInfo * frag_stream_info;

        if (avio_feof(f)) {
            return AVERROR_INVALIDDATA;
        }

        if (version == 1) {
            time   = avio_rb64(f);
            offset = avio_rb64(f);
        } else {
            time   = avio_rb32(f);
            offset = avio_rb32(f);
        }

        // The first sample of each stream in a fragment is always a random
        // access sample.  So it's entry in the tfra can be used as the
        // initial PTS of the fragment.
        index = update_frag_index(mov, offset);
        frag_stream_info = get_frag_stream_info(&mov->frag_index, index, track_id);
        if (frag_stream_info &&
            frag_stream_info->first_tfra_pts == AV_NOPTS_VALUE)
            frag_stream_info->first_tfra_pts = time;

        for (j = 0; j < ((fieldlength >> 4) & 3) + 1; j++)
            avio_r8(f);
        for (j = 0; j < ((fieldlength >> 2) & 3) + 1; j++)
            avio_r8(f);
        for (j = 0; j < ((fieldlength >> 0) & 3) + 1; j++)
            avio_r8(f);
    }

    avio_seek(f, pos + size, SEEK_SET);
    return 0;
}

Project: FFmpeg
File: mov.c

static int build_open_gop_key_points(AVStream *st)
{
    int k;
    int sample_id = 0;
    uint32_t cra_index;
    MOVStreamContext *sc = st->priv_data;

    if (st->codecpar->codec_id != AV_CODEC_ID_HEVC || !sc->sync_group_count)
        return 0;

    /* Build an unrolled index of the samples */
    sc->sample_offsets_count = 0;
    for (uint32_t i = 0; i < sc->ctts_count; i++) {
        if (sc->ctts_data[i].count > INT_MAX - sc->sample_offsets_count)
            return AVERROR(ENOMEM);
        sc->sample_offsets_count += sc->ctts_data[i].count;
    }
    av_freep(&sc->sample_offsets);
    sc->sample_offsets = av_calloc(sc->sample_offsets_count, sizeof(*sc->sample_offsets));
    if (!sc->sample_offsets)
        return AVERROR(ENOMEM);
    k = 0;
    for (uint32_t i = 0; i < sc->ctts_count; i++)
        for (int j = 0; j < sc->ctts_data[i].count; j++)
             sc->sample_offsets[k++] = sc->ctts_data[i].duration;

    /* The following HEVC NAL type reveal the use of open GOP sync points
     * (TODO: BLA types may also be concerned) */
    cra_index = get_sgpd_sync_index(sc, HEVC_NAL_CRA_NUT); /* Clean Random Access */
    if (!cra_index)
        return 0;

    /* Build a list of open-GOP key samples */
    sc->open_key_samples_count = 0;
    for (uint32_t i = 0; i < sc->sync_group_count; i++)
        if (sc->sync_group[i].index == cra_index) {
            if (sc->sync_group[i].count > INT_MAX - sc->open_key_samples_count)
                return AVERROR(ENOMEM);
            sc->open_key_samples_count += sc->sync_group[i].count;
        }
    av_freep(&sc->open_key_samples);
    sc->open_key_samples = av_calloc(sc->open_key_samples_count, sizeof(*sc->open_key_samples));
    if (!sc->open_key_samples)
        return AVERROR(ENOMEM);
    k = 0;
    for (uint32_t i = 0; i < sc->sync_group_count; i++) {
        const MOVSbgp *sg = &sc->sync_group[i];
        if (sg->index == cra_index)
            for (uint32_t j = 0; j < sg->count; j++)
                sc->open_key_samples[k++] = sample_id;
        if (sg->count > INT_MAX - sample_id)
            return AVERROR_PATCHWELCOME;
        sample_id += sg->count;
    }

    /* Identify the minimal time step between samples */
    sc->min_sample_duration = UINT_MAX;
    for (uint32_t i = 0; i < sc->stts_count; i++)
        sc->min_sample_duration = FFMIN(sc->min_sample_duration, sc->stts_data[i].duration);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_saio(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    uint64_t *auxiliary_offsets;
    MOVEncryptionIndex *encryption_index;
    MOVStreamContext *sc;
    int i, ret;
    unsigned int version, entry_count, aux_info_type, aux_info_param;
    unsigned int alloc_size = 0;

    ret = get_current_encryption_info(c, &encryption_index, &sc);
    if (ret != 1)
        return ret;

    if (encryption_index->nb_encrypted_samples) {
        // This can happen if we have both saio/saiz and senc atoms.
        av_log(c->fc, AV_LOG_DEBUG, "Ignoring duplicate encryption info in saio\n");
        return 0;
    }

    if (encryption_index->auxiliary_offsets_count) {
        av_log(c->fc, AV_LOG_ERROR, "Duplicate saio atom\n");
        return AVERROR_INVALIDDATA;
    }

    version = avio_r8(pb); /* version */
    if (avio_rb24(pb) & 0x01) {  /* flags */
        aux_info_type = avio_rb32(pb);
        aux_info_param = avio_rb32(pb);
        if (sc->cenc.default_encrypted_sample) {
            if (aux_info_type != sc->cenc.default_encrypted_sample->scheme) {
                av_log(c->fc, AV_LOG_DEBUG, "Ignoring saio box with non-zero aux_info_type\n");
                return 0;
            }
            if (aux_info_param != 0) {
                av_log(c->fc, AV_LOG_DEBUG, "Ignoring saio box with non-zero aux_info_type_parameter\n");
                return 0;
            }
        } else {
            // Didn't see 'schm' or 'tenc', so this isn't encrypted.
            if ((aux_info_type == MKBETAG('c','e','n','c') ||
                 aux_info_type == MKBETAG('c','e','n','s') ||
                 aux_info_type == MKBETAG('c','b','c','1') ||
                 aux_info_type == MKBETAG('c','b','c','s')) &&
                aux_info_param == 0) {
                av_log(c->fc, AV_LOG_ERROR, "Saw encrypted saio without schm/tenc\n");
                return AVERROR_INVALIDDATA;
            } else {
                return 0;
            }
        }
    } else if (!sc->cenc.default_encrypted_sample) {
        // Didn't see 'schm' or 'tenc', so this isn't encrypted.
        return 0;
    }

    entry_count = avio_rb32(pb);
    if (entry_count >= INT_MAX / sizeof(*auxiliary_offsets))
        return AVERROR(ENOMEM);

    for (i = 0; i < entry_count && !pb->eof_reached; i++) {
        unsigned int min_offsets = FFMIN(FFMAX(i + 1, 1024), entry_count);
        auxiliary_offsets = av_fast_realloc(
            encryption_index->auxiliary_offsets, &alloc_size,
            min_offsets * sizeof(*auxiliary_offsets));
        if (!auxiliary_offsets) {
            av_freep(&encryption_index->auxiliary_offsets);
            return AVERROR(ENOMEM);
        }
        encryption_index->auxiliary_offsets = auxiliary_offsets;

        if (version == 0) {
            encryption_index->auxiliary_offsets[i] = avio_rb32(pb);
        } else {
            encryption_index->auxiliary_offsets[i] = avio_rb64(pb);
        }
        if (c->frag_index.current >= 0) {
            encryption_index->auxiliary_offsets[i] += c->fragment.base_data_offset;
        }
    }

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_ERROR, "Hit EOF while reading saio\n");
        av_freep(&encryption_index->auxiliary_offsets);
        return AVERROR_INVALIDDATA;
    }

    encryption_index->auxiliary_offsets_count = entry_count;

    if (encryption_index->auxiliary_info_sample_count) {
        return mov_parse_auxiliary_info(c, sc, pb, encryption_index);
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_pitm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    avio_rb32(pb);  // version & flags.
    c->primary_item_id = avio_rb16(pb);
    return atom.size;
}

Project: FFmpeg
File: mov.c

static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries;

    if (c->trak_index < 0) {
        av_log(c->fc, AV_LOG_WARNING, "STCO outside TRAK\n");
        return 0;
    }
    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    entries = avio_rb32(pb);

    if (!entries)
        return 0;

    if (sc->chunk_offsets) {
        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicated STCO atom\n");
        return 0;
    }
    av_free(sc->chunk_offsets);
    sc->chunk_count = 0;
    sc->chunk_offsets = av_malloc_array(entries, sizeof(*sc->chunk_offsets));
    if (!sc->chunk_offsets)
        return AVERROR(ENOMEM);
    sc->chunk_count = entries;

    if      (atom.type == MKTAG('s','t','c','o'))
        for (i = 0; i < entries && !pb->eof_reached; i++)
            sc->chunk_offsets[i] = avio_rb32(pb);
    else if (atom.type == MKTAG('c','o','6','4'))
        for (i = 0; i < entries && !pb->eof_reached; i++)
            sc->chunk_offsets[i] = avio_rb64(pb);
    else
        return AVERROR_INVALIDDATA;

    sc->chunk_count = i;

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STCO atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static MOVFragmentStreamInfo * get_current_frag_stream_info(
    MOVFragmentIndex *frag_index)
{
    MOVFragmentIndexItem *item;
    if (frag_index->current < 0 ||
        frag_index->current >= frag_index->nb_items)
        return NULL;

    item = &frag_index->item[frag_index->current];
    if (item->current >= 0 && item->current < item->nb_stream_info)
        return &item->stream_info[item->current];

    // This shouldn't happen
    return NULL;
}

Project: FFmpeg
File: mov.c

static int mov_read_stps(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned i, entries;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_rb32(pb); // version + flags

    entries = avio_rb32(pb);
    if (sc->stps_data)
        av_log(c->fc, AV_LOG_WARNING, "Duplicated STPS atom\n");
    av_free(sc->stps_data);
    sc->stps_count = 0;
    sc->stps_data = av_malloc_array(entries, sizeof(*sc->stps_data));
    if (!sc->stps_data)
        return AVERROR(ENOMEM);

    for (i = 0; i < entries && !pb->eof_reached; i++) {
        sc->stps_data[i] = avio_rb32(pb);
    }

    sc->stps_count = i;

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STPS atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_udta_string(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    char tmp_key[AV_FOURCC_MAX_STRING_SIZE] = {0};
    char key2[32], language[4] = {0};
    char *str = NULL;
    const char *key = NULL;
    uint16_t langcode = 0;
    uint32_t data_type = 0, str_size, str_size_alloc;
    int (*parse)(MOVContext*, AVIOContext*, unsigned, const char*) = NULL;
    int raw = 0;
    int num = 0;

    switch (atom.type) {
    case MKTAG( '@','P','R','M'): key = "premiere_version"; raw = 1; break;
    case MKTAG( '@','P','R','Q'): key = "quicktime_version"; raw = 1; break;
    case MKTAG( 'X','M','P','_'):
        if (c->export_xmp) { key = "xmp"; raw = 1; } break;
    case MKTAG( 'a','A','R','T'): key = "album_artist";    break;
    case MKTAG( 'a','k','I','D'): key = "account_type";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'a','p','I','D'): key = "account_id"; break;
    case MKTAG( 'c','a','t','g'): key = "category"; break;
    case MKTAG( 'c','p','i','l'): key = "compilation";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'c','p','r','t'): key = "copyright"; break;
    case MKTAG( 'd','e','s','c'): key = "description"; break;
    case MKTAG( 'd','i','s','k'): key = "disc";
        parse = mov_metadata_track_or_disc_number; break;
    case MKTAG( 'e','g','i','d'): key = "episode_uid";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'F','I','R','M'): key = "firmware"; raw = 1; break;
    case MKTAG( 'g','n','r','e'): key = "genre";
        parse = mov_metadata_gnre; break;
    case MKTAG( 'h','d','v','d'): key = "hd_video";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'H','M','M','T'):
        return mov_metadata_hmmt(c, pb, atom.size);
    case MKTAG( 'k','e','y','w'): key = "keywords";  break;
    case MKTAG( 'l','d','e','s'): key = "synopsis";  break;
    case MKTAG( 'l','o','c','i'):
        return mov_metadata_loci(c, pb, atom.size);
    case MKTAG( 'm','a','n','u'): key = "make"; break;
    case MKTAG( 'm','o','d','l'): key = "model"; break;
    case MKTAG( 'p','c','s','t'): key = "podcast";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'p','g','a','p'): key = "gapless_playback";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 'p','u','r','d'): key = "purchase_date"; break;
    case MKTAG( 'r','t','n','g'): key = "rating";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 's','o','a','a'): key = "sort_album_artist"; break;
    case MKTAG( 's','o','a','l'): key = "sort_album";   break;
    case MKTAG( 's','o','a','r'): key = "sort_artist";  break;
    case MKTAG( 's','o','c','o'): key = "sort_composer"; break;
    case MKTAG( 's','o','n','m'): key = "sort_name";    break;
    case MKTAG( 's','o','s','n'): key = "sort_show";    break;
    case MKTAG( 's','t','i','k'): key = "media_type";
        parse = mov_metadata_int8_no_padding; break;
    case MKTAG( 't','r','k','n'): key = "track";
        parse = mov_metadata_track_or_disc_number; break;
    case MKTAG( 't','v','e','n'): key = "episode_id"; break;
    case MKTAG( 't','v','e','s'): key = "episode_sort";
        parse = mov_metadata_int8_bypass_padding; break;
    case MKTAG( 't','v','n','n'): key = "network";   break;
    case MKTAG( 't','v','s','h'): key = "show";      break;
    case MKTAG( 't','v','s','n'): key = "season_number";
        parse = mov_metadata_int8_bypass_padding; break;
    case MKTAG(0xa9,'A','R','T'): key = "artist";    break;
    case MKTAG(0xa9,'P','R','D'): key = "producer";  break;
    case MKTAG(0xa9,'a','l','b'): key = "album";     break;
    case MKTAG(0xa9,'a','u','t'): key = "artist";    break;
    case MKTAG(0xa9,'c','h','p'): key = "chapter";   break;
    case MKTAG(0xa9,'c','m','t'): key = "comment";   break;
    case MKTAG(0xa9,'c','o','m'): key = "composer";  break;
    case MKTAG(0xa9,'c','p','y'): key = "copyright"; break;
    case MKTAG(0xa9,'d','a','y'): key = "date";      break;
    case MKTAG(0xa9,'d','i','r'): key = "director";  break;
    case MKTAG(0xa9,'d','i','s'): key = "disclaimer"; break;
    case MKTAG(0xa9,'e','d','1'): key = "edit_date"; break;
    case MKTAG(0xa9,'e','n','c'): key = "encoder";   break;
    case MKTAG(0xa9,'f','m','t'): key = "original_format"; break;
    case MKTAG(0xa9,'g','e','n'): key = "genre";     break;
    case MKTAG(0xa9,'g','r','p'): key = "grouping";  break;
    case MKTAG(0xa9,'h','s','t'): key = "host_computer"; break;
    case MKTAG(0xa9,'i','n','f'): key = "comment";   break;
    case MKTAG(0xa9,'l','y','r'): key = "lyrics";    break;
    case MKTAG(0xa9,'m','a','k'): key = "make";      break;
    case MKTAG(0xa9,'m','o','d'): key = "model";     break;
    case MKTAG(0xa9,'n','a','m'): key = "title";     break;
    case MKTAG(0xa9,'o','p','e'): key = "original_artist"; break;
    case MKTAG(0xa9,'p','r','d'): key = "producer";  break;
    case MKTAG(0xa9,'p','r','f'): key = "performers"; break;
    case MKTAG(0xa9,'r','e','q'): key = "playback_requirements"; break;
    case MKTAG(0xa9,'s','r','c'): key = "original_source"; break;
    case MKTAG(0xa9,'s','t','3'): key = "subtitle";  break;
    case MKTAG(0xa9,'s','w','r'): key = "encoder";   break;
    case MKTAG(0xa9,'t','o','o'): key = "encoder";   break;
    case MKTAG(0xa9,'t','r','k'): key = "track";     break;
    case MKTAG(0xa9,'u','r','l'): key = "URL";       break;
    case MKTAG(0xa9,'w','r','n'): key = "warning";   break;
    case MKTAG(0xa9,'w','r','t'): key = "composer";  break;
    case MKTAG(0xa9,'x','y','z'): key = "location";  break;
    }
retry:
    if (c->itunes_metadata && atom.size > 8) {
        int data_size = avio_rb32(pb);
        int tag = avio_rl32(pb);
        if (tag == MKTAG('d','a','t','a') && data_size <= atom.size && data_size >= 16) {
            data_type = avio_rb32(pb); // type
            avio_rb32(pb); // unknown
            str_size = data_size - 16;
            atom.size -= 16;

            if (!key && c->found_hdlr_mdta && c->meta_keys) {
                uint32_t index = av_bswap32(atom.type); // BE number has been read as LE
                if (index < c->meta_keys_count && index > 0) {
                    key = c->meta_keys[index];
                } else if (atom.type != MKTAG('c', 'o', 'v', 'r')) {
                    av_log(c->fc, AV_LOG_WARNING,
                           "The index of 'data' is out of range: %"PRId32" < 1 or >= %d.\n",
                           index, c->meta_keys_count);
                }
            }
            if (atom.type == MKTAG('c', 'o', 'v', 'r') ||
                (key && !strcmp(key, "com.apple.quicktime.artwork"))) {
                int ret = mov_read_covr(c, pb, data_type, str_size);
                if (ret < 0) {
                    av_log(c->fc, AV_LOG_ERROR, "Error parsing cover art.\n");
                    return ret;
                }
                atom.size -= str_size;
                if (atom.size > 8)
                    goto retry;
                return ret;
            }
        } else return 0;
    } else if (atom.size > 4 && key && !c->itunes_metadata && !raw) {
        str_size = avio_rb16(pb); // string length
        if (str_size > atom.size) {
            raw = 1;
            avio_seek(pb, -2, SEEK_CUR);
            av_log(c->fc, AV_LOG_WARNING, "UDTA parsing failed retrying raw\n");
            goto retry;
        }
        langcode = avio_rb16(pb);
        ff_mov_lang_to_iso639(langcode, language);
        atom.size -= 4;
    } else
        str_size = atom.size;

    if (c->export_all && !key) {
        key = av_fourcc_make_string(tmp_key, atom.type);
    }

    if (!key)
        return 0;
    if (atom.size < 0 || str_size >= INT_MAX/2)
        return AVERROR_INVALIDDATA;

    // Allocates enough space if data_type is a int32 or float32 number, otherwise
    // worst-case requirement for output string in case of utf8 coded input
    num = (data_type >= 21 && data_type <= 23);
    str_size_alloc = (num ? 512 : (raw ? str_size : str_size * 2)) + 1;
    str = av_mallocz(str_size_alloc);
    if (!str)
        return AVERROR(ENOMEM);

    if (parse)
        parse(c, pb, str_size, key);
    else {
        if (!raw && (data_type == 3 || (data_type == 0 && (langcode < 0x400 || langcode == 0x7fff)))) { // MAC Encoded
            mov_read_mac_string(c, pb, str_size, str, str_size_alloc);
        } else if (data_type == 21) { // BE signed integer, variable size
            int val = 0;
            if (str_size == 1)
                val = (int8_t)avio_r8(pb);
            else if (str_size == 2)
                val = (int16_t)avio_rb16(pb);
            else if (str_size == 3)
                val = ((int32_t)(avio_rb24(pb)<<8))>>8;
            else if (str_size == 4)
                val = (int32_t)avio_rb32(pb);
            if (snprintf(str, str_size_alloc, "%d", val) >= str_size_alloc) {
                av_log(c->fc, AV_LOG_ERROR,
                       "Failed to store the number (%d) in string.\n", val);
                av_free(str);
                return AVERROR_INVALIDDATA;
            }
        } else if (data_type == 22) { // BE unsigned integer, variable size
            unsigned int val = 0;
            if (str_size == 1)
                val = avio_r8(pb);
            else if (str_size == 2)
                val = avio_rb16(pb);
            else if (str_size == 3)
                val = avio_rb24(pb);
            else if (str_size == 4)
                val = avio_rb32(pb);
            if (snprintf(str, str_size_alloc, "%u", val) >= str_size_alloc) {
                av_log(c->fc, AV_LOG_ERROR,
                       "Failed to store the number (%u) in string.\n", val);
                av_free(str);
                return AVERROR_INVALIDDATA;
            }
        } else if (data_type == 23 && str_size >= 4) {  // BE float32
            float val = av_int2float(avio_rb32(pb));
            if (snprintf(str, str_size_alloc, "%f", val) >= str_size_alloc) {
                av_log(c->fc, AV_LOG_ERROR,
                       "Failed to store the float32 number (%f) in string.\n", val);
                av_free(str);
                return AVERROR_INVALIDDATA;
            }
        } else if (data_type > 1 && data_type != 4) {
            // data_type can be 0 if not set at all above. data_type 1 means
            // UTF8 and 4 means "UTF8 sort". For any other type (UTF16 or e.g.
            // a picture), don't return it blindly in a string that is supposed
            // to be UTF8 text.
            av_log(c->fc, AV_LOG_WARNING, "Skipping unhandled metadata %s of type %d\n", key, data_type);
            av_free(str);
            return 0;
        } else {
            int ret = ffio_read_size(pb, str, str_size);
            if (ret < 0) {
                av_free(str);
                return ret;
            }
            str[str_size] = 0;
        }
        c->fc->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
        av_dict_set(&c->fc->metadata, key, str, 0);
        if (*language && strcmp(language, "und")) {
            snprintf(key2, sizeof(key2), "%s-%s", key, language);
            av_dict_set(&c->fc->metadata, key2, str, 0);
        }
        if (!strcmp(key, "encoder")) {
            int major, minor, micro;
            if (sscanf(str, "HandBrake %d.%d.%d", &major, &minor, &micro) == 3) {
                c->handbrake_version = 1000000*major + 1000*minor + micro;
            }
        }
    }

    av_freep(&str);
    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_estimate_video_delay(MOVContext *c, AVStream* st)
{
    MOVStreamContext *msc = st->priv_data;
    FFStream *const sti = ffstream(st);
    int ctts_ind = 0;
    int ctts_sample = 0;
    int64_t pts_buf[MAX_REORDER_DELAY + 1]; // Circular buffer to sort pts.
    int buf_start = 0;
    int j, r, num_swaps;

    for (j = 0; j < MAX_REORDER_DELAY + 1; j++)
        pts_buf[j] = INT64_MIN;

    if (st->codecpar->video_delay <= 0 && msc->ctts_data &&
        st->codecpar->codec_id == AV_CODEC_ID_H264) {
        st->codecpar->video_delay = 0;
        for (int ind = 0; ind < sti->nb_index_entries && ctts_ind < msc->ctts_count; ++ind) {
            // Point j to the last elem of the buffer and insert the current pts there.
            j = buf_start;
            buf_start = (buf_start + 1);
            if (buf_start == MAX_REORDER_DELAY + 1)
                buf_start = 0;

            pts_buf[j] = sti->index_entries[ind].timestamp + msc->ctts_data[ctts_ind].duration;

            // The timestamps that are already in the sorted buffer, and are greater than the
            // current pts, are exactly the timestamps that need to be buffered to output PTS
            // in correct sorted order.
            // Hence the video delay (which is the buffer size used to sort DTS and output PTS),
            // can be computed as the maximum no. of swaps any particular timestamp needs to
            // go through, to keep this buffer in sorted order.
            num_swaps = 0;
            while (j != buf_start) {
                r = j - 1;
                if (r < 0) r = MAX_REORDER_DELAY;
                if (pts_buf[j] < pts_buf[r]) {
                    FFSWAP(int64_t, pts_buf[j], pts_buf[r]);
                    ++num_swaps;
                } else {
                    break;
                }
                j = r;
            }
            st->codecpar->video_delay = FFMAX(st->codecpar->video_delay, num_swaps);

            ctts_sample++;
            if (ctts_sample == msc->ctts_data[ctts_ind].count) {
                ctts_ind++;
                ctts_sample = 0;
            }
        }
        av_log(c->fc, AV_LOG_DEBUG, "Setting codecpar->delay to %d for stream st: %d\n",
               st->codecpar->video_delay, st->index);
    }
}

Project: FFmpeg
File: mov.c

static int mov_read_dvc1(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    uint8_t profile_level;
    int ret;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if (atom.size >= (1<<28) || atom.size < 7)
        return AVERROR_INVALIDDATA;

    profile_level = avio_r8(pb);
    if ((profile_level & 0xf0) != 0xc0)
        return 0;

    avio_seek(pb, 6, SEEK_CUR);
    ret = ff_get_extradata(c->fc, st->codecpar, pb, atom.size - 7);
    if (ret < 0)
        return ret;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_schm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    if (sc->pseudo_stream_id != 0) {
        av_log(c->fc, AV_LOG_ERROR, "schm boxes are only supported in first sample descriptor\n");
        return AVERROR_PATCHWELCOME;
    }

    if (atom.size < 8)
        return AVERROR_INVALIDDATA;

    avio_rb32(pb); /* version and flags */

    if (!sc->cenc.default_encrypted_sample) {
        sc->cenc.default_encrypted_sample = av_encryption_info_alloc(0, 16, 16);
        if (!sc->cenc.default_encrypted_sample) {
            return AVERROR(ENOMEM);
        }
    }

    sc->cenc.default_encrypted_sample->scheme = avio_rb32(pb);
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    uint32_t minor_ver;
    int comp_brand_size;
    char* comp_brands_str;
    uint8_t type[5] = {0};
    int ret = ffio_read_size(pb, type, 4);
    if (ret < 0)
        return ret;

    if (strcmp(type, "qt  "))
        c->isom = 1;
    av_log(c->fc, AV_LOG_DEBUG, "ISO: File Type Major Brand: %.4s\n",(char *)&type);
    av_dict_set(&c->fc->metadata, "major_brand", type, 0);
    c->is_still_picture_avif = !strncmp(type, "avif", 4);
    minor_ver = avio_rb32(pb); /* minor version */
    av_dict_set_int(&c->fc->metadata, "minor_version", minor_ver, 0);

    comp_brand_size = atom.size - 8;
    if (comp_brand_size < 0 || comp_brand_size == INT_MAX)
        return AVERROR_INVALIDDATA;
    comp_brands_str = av_malloc(comp_brand_size + 1); /* Add null terminator */
    if (!comp_brands_str)
        return AVERROR(ENOMEM);

    ret = ffio_read_size(pb, comp_brands_str, comp_brand_size);
    if (ret < 0) {
        av_freep(&comp_brands_str);
        return ret;
    }
    comp_brands_str[comp_brand_size] = 0;
    av_dict_set(&c->fc->metadata, "compatible_brands",
                comp_brands_str, AV_DICT_DONT_STRDUP_VAL);

    // Logic for handling Audible's .aaxc files
    if (!strcmp(type, "aaxc")) {
        mov_aaxc_crypto(c);
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_sample_encryption_info(MOVContext *c, AVIOContext *pb, MOVStreamContext *sc, AVEncryptionInfo **sample, int use_subsamples)
{
    int i, ret;
    unsigned int subsample_count;
    AVSubsampleEncryptionInfo *subsamples;

    if (!sc->cenc.default_encrypted_sample) {
        av_log(c->fc, AV_LOG_ERROR, "Missing schm or tenc\n");
        return AVERROR_INVALIDDATA;
    }

    *sample = av_encryption_info_clone(sc->cenc.default_encrypted_sample);
    if (!*sample)
        return AVERROR(ENOMEM);

    if (sc->cenc.per_sample_iv_size != 0) {
        if ((ret = ffio_read_size(pb, (*sample)->iv, sc->cenc.per_sample_iv_size)) < 0) {
            av_log(c->fc, AV_LOG_ERROR, "failed to read the initialization vector\n");
            av_encryption_info_free(*sample);
            *sample = NULL;
            return ret;
        }
    }

    if (use_subsamples) {
        subsample_count = avio_rb16(pb);
        av_free((*sample)->subsamples);
        (*sample)->subsamples = av_calloc(subsample_count, sizeof(*subsamples));
        if (!(*sample)->subsamples) {
            av_encryption_info_free(*sample);
            *sample = NULL;
            return AVERROR(ENOMEM);
        }

        for (i = 0; i < subsample_count && !pb->eof_reached; i++) {
            (*sample)->subsamples[i].bytes_of_clear_data = avio_rb16(pb);
            (*sample)->subsamples[i].bytes_of_protected_data = avio_rb32(pb);
        }

        if (pb->eof_reached) {
            av_log(c->fc, AV_LOG_ERROR, "hit EOF while reading sub-sample encryption info\n");
            av_encryption_info_free(*sample);
            *sample = NULL;
            return AVERROR_INVALIDDATA;
        }
        (*sample)->subsample_count = subsample_count;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_covr(MOVContext *c, AVIOContext *pb, int type, int len)
{
    AVStream *st;
    MOVStreamContext *sc;
    enum AVCodecID id;
    int ret;

    switch (type) {
    case 0xd:  id = AV_CODEC_ID_MJPEG; break;
    case 0xe:  id = AV_CODEC_ID_PNG;   break;
    case 0x1b: id = AV_CODEC_ID_BMP;   break;
    default:
        av_log(c->fc, AV_LOG_WARNING, "Unknown cover type: 0x%x.\n", type);
        avio_skip(pb, len);
        return 0;
    }

    sc = av_mallocz(sizeof(*sc));
    if (!sc)
        return AVERROR(ENOMEM);
    ret = ff_add_attached_pic(c->fc, NULL, pb, NULL, len);
    if (ret < 0) {
        av_free(sc);
        return ret;
    }
    st = c->fc->streams[c->fc->nb_streams - 1];
    st->priv_data = sc;

    if (st->attached_pic.size >= 8 && id != AV_CODEC_ID_BMP) {
        if (AV_RB64(st->attached_pic.data) == 0x89504e470d0a1a0a) {
            id = AV_CODEC_ID_PNG;
        } else {
            id = AV_CODEC_ID_MJPEG;
        }
    }
    st->codecpar->codec_id   = id;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_aaxc_crypto(MOVContext *c)
{
    if (c->audible_key_size != 16) {
        av_log(c->fc, AV_LOG_FATAL, "[aaxc] audible_key value needs to be 16 bytes!\n");
        return AVERROR(EINVAL);
    }

    if (c->audible_iv_size != 16) {
        av_log(c->fc, AV_LOG_FATAL, "[aaxc] audible_iv value needs to be 16 bytes!\n");
        return AVERROR(EINVAL);
    }

    c->aes_decrypt = av_aes_alloc();
    if (!c->aes_decrypt) {
        return AVERROR(ENOMEM);
    }

    memcpy(c->file_key, c->audible_key, 16);
    memcpy(c->file_iv, c->audible_iv, 16);
    c->aax_mode = 1;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_sgpd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    uint8_t version;
    uint32_t grouping_type;
    uint32_t default_length;
    av_unused uint32_t default_group_description_index;
    uint32_t entry_count;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams - 1];
    sc = st->priv_data;

    version = avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */
    grouping_type = avio_rl32(pb);

    /*
     * This function only supports "sync" boxes, but the code is able to parse
     * other boxes (such as "tscl", "tsas" and "stsa")
     */
    if (grouping_type != MKTAG('s','y','n','c'))
        return 0;

    default_length = version >= 1 ? avio_rb32(pb) : 0;
    default_group_description_index = version >= 2 ? avio_rb32(pb) : 0;
    entry_count = avio_rb32(pb);

    av_freep(&sc->sgpd_sync);
    sc->sgpd_sync_count = entry_count;
    sc->sgpd_sync = av_calloc(entry_count, sizeof(*sc->sgpd_sync));
    if (!sc->sgpd_sync)
        return AVERROR(ENOMEM);

    for (uint32_t i = 0; i < entry_count && !pb->eof_reached; i++) {
        uint32_t description_length = default_length;
        if (version >= 1 && default_length == 0)
            description_length = avio_rb32(pb);
        if (grouping_type == MKTAG('s','y','n','c')) {
            const uint8_t nal_unit_type = avio_r8(pb) & 0x3f;
            sc->sgpd_sync[i] = nal_unit_type;
            description_length -= 1;
        }
        avio_skip(pb, description_length);
    }

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted SGPD atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static uint32_t get_sgpd_sync_index(const MOVStreamContext *sc, int nal_unit_type)
{
    for (uint32_t i = 0; i < sc->sgpd_sync_count; i++)
        if (sc->sgpd_sync[i] == HEVC_NAL_CRA_NUT)
            return i + 1;
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_smdm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVStreamContext *sc;
    int i, version;

    if (c->fc->nb_streams < 1)
        return AVERROR_INVALIDDATA;

    sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;

    if (atom.size < 5) {
        av_log(c->fc, AV_LOG_ERROR, "Empty Mastering Display Metadata box\n");
        return AVERROR_INVALIDDATA;
    }

    version = avio_r8(pb);
    if (version) {
        av_log(c->fc, AV_LOG_WARNING, "Unsupported Mastering Display Metadata box version %d\n", version);
        return 0;
    }
    if (sc->mastering)
        return AVERROR_INVALIDDATA;

    avio_skip(pb, 3); /* flags */

    sc->mastering = av_mastering_display_metadata_alloc();
    if (!sc->mastering)
        return AVERROR(ENOMEM);

    for (i = 0; i < 3; i++) {
        sc->mastering->display_primaries[i][0] = av_make_q(avio_rb16(pb), 1 << 16);
        sc->mastering->display_primaries[i][1] = av_make_q(avio_rb16(pb), 1 << 16);
    }
    sc->mastering->white_point[0] = av_make_q(avio_rb16(pb), 1 << 16);
    sc->mastering->white_point[1] = av_make_q(avio_rb16(pb), 1 << 16);

    sc->mastering->max_luminance = av_make_q(avio_rb32(pb), 1 << 8);
    sc->mastering->min_luminance = av_make_q(avio_rb32(pb), 1 << 14);

    sc->mastering->has_primaries = 1;
    sc->mastering->has_luminance = 1;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_try_read_block(AVIOContext *pb, size_t size, uint8_t **data)
{
    const unsigned int block_size = 1024 * 1024;
    uint8_t *buffer = NULL;
    unsigned int alloc_size = 0, offset = 0;
    while (offset < size) {
        unsigned int new_size =
            alloc_size >= INT_MAX - block_size ? INT_MAX : alloc_size + block_size;
        uint8_t *new_buffer = av_fast_realloc(buffer, &alloc_size, new_size);
        unsigned int to_read = FFMIN(size, alloc_size) - offset;
        if (!new_buffer) {
            av_free(buffer);
            return AVERROR(ENOMEM);
        }
        buffer = new_buffer;

        if (avio_read(pb, buffer + offset, to_read) != to_read) {
            av_free(buffer);
            return AVERROR_INVALIDDATA;
        }
        offset += to_read;
    }

    *data = buffer;
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_enda(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int little_endian = avio_rb16(pb) & 0xFF;
    av_log(c->fc, AV_LOG_TRACE, "enda %d\n", little_endian);
    if (little_endian == 1)
        set_last_stream_little_endian(c->fc);
    return 0;
}

Project: FFmpeg
File: mov.c

static int update_frag_index(MOVContext *c, int64_t offset)
{
    int index, i;
    MOVFragmentIndexItem * item;
    MOVFragmentStreamInfo * frag_stream_info;

    // If moof_offset already exists in frag_index, return index to it
    index = search_frag_moof_offset(&c->frag_index, offset);
    if (index < c->frag_index.nb_items &&
        c->frag_index.item[index].moof_offset == offset)
        return index;

    // offset is not yet in frag index.
    // Insert new item at index (sorted by moof offset)
    item = av_fast_realloc(c->frag_index.item,
                           &c->frag_index.allocated_size,
                           (c->frag_index.nb_items + 1) *
                           sizeof(*c->frag_index.item));
    if (!item)
        return -1;
    c->frag_index.item = item;

    frag_stream_info = av_realloc_array(NULL, c->fc->nb_streams,
                                        sizeof(*item->stream_info));
    if (!frag_stream_info)
        return -1;

    for (i = 0; i < c->fc->nb_streams; i++) {
        // Avoid building frag index if streams lack track id.
        if (c->fc->streams[i]->id < 0) {
            av_free(frag_stream_info);
            return AVERROR_INVALIDDATA;
        }

        frag_stream_info[i].id = c->fc->streams[i]->id;
        frag_stream_info[i].sidx_pts = AV_NOPTS_VALUE;
        frag_stream_info[i].tfdt_dts = AV_NOPTS_VALUE;
        frag_stream_info[i].next_trun_dts = AV_NOPTS_VALUE;
        frag_stream_info[i].first_tfra_pts = AV_NOPTS_VALUE;
        frag_stream_info[i].index_base = -1;
        frag_stream_info[i].index_entry = -1;
        frag_stream_info[i].encryption_index = NULL;
    }

    if (index < c->frag_index.nb_items)
        memmove(c->frag_index.item + index + 1, c->frag_index.item + index,
                (c->frag_index.nb_items - index) * sizeof(*c->frag_index.item));

    item = &c->frag_index.item[index];
    item->headers_read = 0;
    item->current = 0;
    item->nb_stream_info = c->fc->nb_streams;
    item->moof_offset = offset;
    item->stream_info = frag_stream_info;
    c->frag_index.nb_items++;

    return index;
}

Project: FFmpeg
File: mov.c

static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int64_t stream_size = avio_size(pb);
    int64_t offset = av_sat_add64(avio_tell(pb), atom.size), pts, timestamp;
    uint8_t version, is_complete;
    int64_t offadd;
    unsigned i, j, track_id, item_count;
    AVStream *st = NULL;
    AVStream *ref_st = NULL;
    MOVStreamContext *sc, *ref_sc = NULL;
    AVRational timescale;

    version = avio_r8(pb);
    if (version > 1) {
        avpriv_request_sample(c->fc, "sidx version %u", version);
        return 0;
    }

    avio_rb24(pb); // flags

    track_id = avio_rb32(pb); // Reference ID
    for (i = 0; i < c->fc->nb_streams; i++) {
        if (c->fc->streams[i]->id == track_id) {
            st = c->fc->streams[i];
            break;
        }
    }
    if (!st) {
        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding track id %d\n", track_id);
        return 0;
    }

    sc = st->priv_data;

    timescale = av_make_q(1, avio_rb32(pb));

    if (timescale.den <= 0) {
        av_log(c->fc, AV_LOG_ERROR, "Invalid sidx timescale 1/%d\n", timescale.den);
        return AVERROR_INVALIDDATA;
    }

    if (version == 0) {
        pts = avio_rb32(pb);
        offadd= avio_rb32(pb);
    } else {
        pts = avio_rb64(pb);
        offadd= avio_rb64(pb);
    }
    if (av_sat_add64(offset, offadd) != offset + (uint64_t)offadd)
        return AVERROR_INVALIDDATA;

    offset += (uint64_t)offadd;

    avio_rb16(pb); // reserved

    item_count = avio_rb16(pb);
    if (item_count == 0)
        return AVERROR_INVALIDDATA;

    for (i = 0; i < item_count; i++) {
        int index;
        MOVFragmentStreamInfo * frag_stream_info;
        uint32_t size = avio_rb32(pb);
        uint32_t duration = avio_rb32(pb);
        if (size & 0x80000000) {
            avpriv_request_sample(c->fc, "sidx reference_type 1");
            return AVERROR_PATCHWELCOME;
        }
        avio_rb32(pb); // sap_flags
        timestamp = av_rescale_q(pts, timescale, st->time_base);

        index = update_frag_index(c, offset);
        frag_stream_info = get_frag_stream_info(&c->frag_index, index, track_id);
        if (frag_stream_info)
            frag_stream_info->sidx_pts = timestamp;

        if (av_sat_add64(offset, size) != offset + (uint64_t)size ||
            av_sat_add64(pts, duration) != pts + (uint64_t)duration
        )
            return AVERROR_INVALIDDATA;
        offset += size;
        pts += duration;
    }

    st->duration = sc->track_end = pts;

    sc->has_sidx = 1;

    // See if the remaining bytes are just an mfra which we can ignore.
    is_complete = offset == stream_size;
    if (!is_complete && (pb->seekable & AVIO_SEEKABLE_NORMAL) && stream_size > 0 ) {
        int64_t ret;
        int64_t original_pos = avio_tell(pb);
        if (!c->have_read_mfra_size) {
            if ((ret = avio_seek(pb, stream_size - 4, SEEK_SET)) < 0)
                return ret;
            c->mfra_size = avio_rb32(pb);
            c->have_read_mfra_size = 1;
            if ((ret = avio_seek(pb, original_pos, SEEK_SET)) < 0)
                return ret;
        }
        if (offset == stream_size - c->mfra_size)
            is_complete = 1;
    }

    if (is_complete) {
        // Find first entry in fragment index that came from an sidx.
        // This will pretty much always be the first entry.
        for (i = 0; i < c->frag_index.nb_items; i++) {
            MOVFragmentIndexItem * item = &c->frag_index.item[i];
            for (j = 0; ref_st == NULL && j < item->nb_stream_info; j++) {
                MOVFragmentStreamInfo * si;
                si = &item->stream_info[j];
                if (si->sidx_pts != AV_NOPTS_VALUE) {
                    ref_st = c->fc->streams[j];
                    ref_sc = ref_st->priv_data;
                    break;
                }
            }
        }
        if (ref_st) for (i = 0; i < c->fc->nb_streams; i++) {
            st = c->fc->streams[i];
            sc = st->priv_data;
            if (!sc->has_sidx) {
                st->duration = sc->track_end = av_rescale(ref_st->duration, sc->time_scale, ref_sc->time_scale);
            }
        }

        c->frag_index.complete = 1;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int cenc_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryptionInfo *sample, uint8_t *input, int size)
{
    int i, ret;
    int bytes_of_protected_data;

    if (!sc->cenc.aes_ctr) {
        /* initialize the cipher */
        sc->cenc.aes_ctr = av_aes_ctr_alloc();
        if (!sc->cenc.aes_ctr) {
            return AVERROR(ENOMEM);
        }

        ret = av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
        if (ret < 0) {
            return ret;
        }
    }

    av_aes_ctr_set_full_iv(sc->cenc.aes_ctr, sample->iv);

    if (!sample->subsample_count) {
        /* decrypt the whole packet */
        av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, size);
        return 0;
    }

    for (i = 0; i < sample->subsample_count; i++) {
        if (sample->subsamples[i].bytes_of_clear_data + sample->subsamples[i].bytes_of_protected_data > size) {
            av_log(c->fc, AV_LOG_ERROR, "subsample size exceeds the packet size left\n");
            return AVERROR_INVALIDDATA;
        }

        /* skip the clear bytes */
        input += sample->subsamples[i].bytes_of_clear_data;
        size -= sample->subsamples[i].bytes_of_clear_data;

        /* decrypt the encrypted bytes */

        bytes_of_protected_data = sample->subsamples[i].bytes_of_protected_data;
        av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, bytes_of_protected_data);

        input += bytes_of_protected_data;
        size -= bytes_of_protected_data;
    }

    if (size > 0) {
        av_log(c->fc, AV_LOG_ERROR, "leftover packet bytes after subsample processing\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int get_eia608_packet(AVIOContext *pb, AVPacket *pkt, int size)
{
    int new_size, ret;

    if (size <= 8)
        return AVERROR_INVALIDDATA;
    new_size = ((size - 8) / 2) * 3;
    ret = av_new_packet(pkt, new_size);
    if (ret < 0)
        return ret;

    avio_skip(pb, 8);
    for (int j = 0; j < new_size; j += 3) {
        pkt->data[j] = 0xFC;
        pkt->data[j+1] = avio_r8(pb);
        pkt->data[j+2] = avio_r8(pb);
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_close(AVFormatContext *s)
{
    MOVContext *mov = s->priv_data;
    int i, j;

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        MOVStreamContext *sc = st->priv_data;

        if (!sc)
            continue;

        av_freep(&sc->ctts_data);
        for (j = 0; j < sc->drefs_count; j++) {
            av_freep(&sc->drefs[j].path);
            av_freep(&sc->drefs[j].dir);
        }
        av_freep(&sc->drefs);

        sc->drefs_count = 0;

        if (!sc->pb_is_copied)
            ff_format_io_close(s, &sc->pb);

        sc->pb = NULL;
        av_freep(&sc->chunk_offsets);
        av_freep(&sc->stsc_data);
        av_freep(&sc->sample_sizes);
        av_freep(&sc->keyframes);
        av_freep(&sc->stts_data);
        av_freep(&sc->sdtp_data);
        av_freep(&sc->stps_data);
        av_freep(&sc->elst_data);
        av_freep(&sc->rap_group);
        av_freep(&sc->sync_group);
        av_freep(&sc->sgpd_sync);
        av_freep(&sc->sample_offsets);
        av_freep(&sc->open_key_samples);
        av_freep(&sc->display_matrix);
        av_freep(&sc->index_ranges);

        if (sc->extradata)
            for (j = 0; j < sc->stsd_count; j++)
                av_free(sc->extradata[j]);
        av_freep(&sc->extradata);
        av_freep(&sc->extradata_size);

        mov_free_encryption_index(&sc->cenc.encryption_index);
        av_encryption_info_free(sc->cenc.default_encrypted_sample);
        av_aes_ctr_free(sc->cenc.aes_ctr);

        av_freep(&sc->stereo3d);
        av_freep(&sc->spherical);
        av_freep(&sc->mastering);
        av_freep(&sc->coll);
    }

    av_freep(&mov->dv_demux);
    avformat_free_context(mov->dv_fctx);
    mov->dv_fctx = NULL;

    if (mov->meta_keys) {
        for (i = 1; i < mov->meta_keys_count; i++) {
            av_freep(&mov->meta_keys[i]);
        }
        av_freep(&mov->meta_keys);
    }

    av_freep(&mov->trex_data);
    av_freep(&mov->bitrates);

    for (i = 0; i < mov->frag_index.nb_items; i++) {
        MOVFragmentStreamInfo *frag = mov->frag_index.item[i].stream_info;
        for (j = 0; j < mov->frag_index.item[i].nb_stream_info; j++) {
            mov_free_encryption_index(&frag[j].encryption_index);
        }
        av_freep(&mov->frag_index.item[i].stream_info);
    }
    av_freep(&mov->frag_index.item);

    av_freep(&mov->aes_decrypt);
    av_freep(&mov->chapter_tracks);
    av_freep(&mov->avif_info);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_pcmc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int format_flags;

    if (atom.size < 6) {
        av_log(c->fc, AV_LOG_ERROR, "Empty pcmC box\n");
        return AVERROR_INVALIDDATA;
    }

    avio_r8(pb);    // version
    avio_rb24(pb);  // flags
    format_flags = avio_r8(pb);
    if (format_flags == 1) // indicates little-endian format. If not present, big-endian format is used
        set_last_stream_little_endian(c->fc);

    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_parse_stsd_subtitle(MOVContext *c, AVIOContext *pb,
                                    AVStream *st, MOVStreamContext *sc,
                                    int64_t size)
{
    // ttxt stsd contains display flags, justification, background
    // color, fonts, and default styles, so fake an atom to read it
    MOVAtom fake_atom = { .size = size };
    // mp4s contains a regular esds atom
    if (st->codecpar->codec_tag != AV_RL32("mp4s"))
        mov_read_glbl(c, pb, fake_atom);
    st->codecpar->width  = sc->width;
    st->codecpar->height = sc->height;
}

Project: FFmpeg
File: mov.c

static int mov_read_rtmd_track(AVFormatContext *s, AVStream *st)
{
    MOVStreamContext *sc = st->priv_data;
    FFStream *const sti = ffstream(st);
    char buf[AV_TIMECODE_STR_SIZE];
    int64_t cur_pos = avio_tell(sc->pb);
    int hh, mm, ss, ff, drop;

    if (!sti->nb_index_entries)
        return -1;

    avio_seek(sc->pb, sti->index_entries->pos, SEEK_SET);
    avio_skip(s->pb, 13);
    hh = avio_r8(s->pb);
    mm = avio_r8(s->pb);
    ss = avio_r8(s->pb);
    drop = avio_r8(s->pb);
    ff = avio_r8(s->pb);
    snprintf(buf, AV_TIMECODE_STR_SIZE, "%02d:%02d:%02d%c%02d",
             hh, mm, ss, drop ? ';' : ':', ff);
    av_dict_set(&st->metadata, "timecode", buf, 0);

    avio_seek(sc->pb, cur_pos, SEEK_SET);
    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_metadata_creation_time(AVDictionary **metadata, int64_t time, void *logctx)
{
    if (time) {
        if (time >= 2082844800)
            time -= 2082844800;  /* seconds between 1904-01-01 and Epoch */

        if ((int64_t)(time * 1000000ULL) / 1000000 != time) {
            av_log(logctx, AV_LOG_DEBUG, "creation_time is not representable\n");
            return;
        }

        avpriv_dict_set_timestamp(metadata, "creation_time", time * 1000000);
    }
}

Project: FFmpeg
File: mov.c

static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    while (atom.size > 8) {
        uint32_t tag;
        if (avio_feof(pb))
            return AVERROR_EOF;
        tag = avio_rl32(pb);
        atom.size -= 4;
        if (tag == MKTAG('h','d','l','r')) {
            int ret;
            avio_seek(pb, -8, SEEK_CUR);
            atom.size += 8;
            if ((ret = mov_read_default(c, pb, atom)) < 0)
                return ret;
            if (c->is_still_picture_avif) {
                int ret;
                // Add a stream for the YUV planes (primary item).
                if ((ret = avif_add_stream(c, c->primary_item_id)) < 0)
                    return ret;
                // For still AVIF images, the meta box contains all the
                // necessary information that would generally be provided by the
                // moov box. So simply mark that we have found the moov box so
                // that parsing can continue.
                c->found_moov = 1;
            }
            return ret;
        }
    }
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_probe(const AVProbeData *p)
{
    int64_t offset;
    uint32_t tag;
    int score = 0;
    int moov_offset = -1;

    /* check file header */
    offset = 0;
    for (;;) {
        int64_t size;
        int minsize = 8;
        /* ignore invalid offset */
        if ((offset + 8ULL) > (unsigned int)p->buf_size)
            break;
        size = AV_RB32(p->buf + offset);
        if (size == 1 && offset + 16 <= (unsigned int)p->buf_size) {
            size = AV_RB64(p->buf+offset + 8);
            minsize = 16;
        } else if (size == 0) {
            size = p->buf_size - offset;
        }
        if (size < minsize) {
            offset += 4;
            continue;
        }
        tag = AV_RL32(p->buf + offset + 4);
        switch(tag) {
        /* check for obvious tags */
        case MKTAG('m','o','o','v'):
            moov_offset = offset + 4;
        case MKTAG('m','d','a','t'):
        case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
        case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
        case MKTAG('f','t','y','p'):
            if (tag == MKTAG('f','t','y','p') &&
                       (   AV_RL32(p->buf + offset + 8) == MKTAG('j','p','2',' ')
                        || AV_RL32(p->buf + offset + 8) == MKTAG('j','p','x',' ')
                        || AV_RL32(p->buf + offset + 8) == MKTAG('j','x','l',' ')
                    )) {
                score = FFMAX(score, 5);
            } else {
                score = AVPROBE_SCORE_MAX;
            }
            break;
        /* those are more common words, so rate then a bit less */
        case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
        case MKTAG('w','i','d','e'):
        case MKTAG('f','r','e','e'):
        case MKTAG('j','u','n','k'):
        case MKTAG('p','i','c','t'):
            score  = FFMAX(score, AVPROBE_SCORE_MAX - 5);
            break;
        case MKTAG(0x82,0x82,0x7f,0x7d):
        case MKTAG('s','k','i','p'):
        case MKTAG('u','u','i','d'):
        case MKTAG('p','r','f','l'):
            /* if we only find those cause probedata is too small at least rate them */
            score  = FFMAX(score, AVPROBE_SCORE_EXTENSION);
            break;
        }
        if (size > INT64_MAX - offset)
            break;
        offset += size;
    }
    if (score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {
        /* moov atom in the header - we should make sure that this is not a
         * MOV-packed MPEG-PS */
        offset = moov_offset;

        while (offset < (p->buf_size - 16)) { /* Sufficient space */
               /* We found an actual hdlr atom */
            if (AV_RL32(p->buf + offset     ) == MKTAG('h','d','l','r') &&
                AV_RL32(p->buf + offset +  8) == MKTAG('m','h','l','r') &&
                AV_RL32(p->buf + offset + 12) == MKTAG('M','P','E','G')) {
                av_log(NULL, AV_LOG_WARNING, "Found media data tag MPEG indicating this is a MOV-packed MPEG-PS.\n");
                /* We found a media handler reference atom describing an
                 * MPEG-PS-in-MOV, return a
                 * low score to force expanding the probe window until
                 * mpegps_probe finds what it needs */
                return 5;
            } else {
                /* Keep looking */
                offset += 2;
            }
        }
    }

    return score;
}

Project: FFmpeg
File: mov.c

static void fix_frag_index_entries(MOVFragmentIndex *frag_index, int index,
                                   int id, int entries)
{
    int i;
    MOVFragmentStreamInfo * frag_stream_info;

    if (index < 0)
        return;
    for (i = index; i < frag_index->nb_items; i++) {
        frag_stream_info = get_frag_stream_info(frag_index, i, id);
        if (frag_stream_info && frag_stream_info->index_entry >= 0)
            frag_stream_info->index_entry += entries;
    }
}

Project: FFmpeg
File: mov.c

static int mov_read_header(AVFormatContext *s)
{
    MOVContext *mov = s->priv_data;
    AVIOContext *pb = s->pb;
    int j, err;
    MOVAtom atom = { AV_RL32("root") };
    int i;

    if (mov->decryption_key_len != 0 && mov->decryption_key_len != AES_CTR_KEY_SIZE) {
        av_log(s, AV_LOG_ERROR, "Invalid decryption key len %d expected %d\n",
            mov->decryption_key_len, AES_CTR_KEY_SIZE);
        return AVERROR(EINVAL);
    }

    mov->fc = s;
    mov->trak_index = -1;
    /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
    if (pb->seekable & AVIO_SEEKABLE_NORMAL)
        atom.size = avio_size(pb);
    else
        atom.size = INT64_MAX;

    /* check MOV header */
    do {
        if (mov->moov_retry)
            avio_seek(pb, 0, SEEK_SET);
        if ((err = mov_read_default(mov, pb, atom)) < 0) {
            av_log(s, AV_LOG_ERROR, "error reading header\n");
            return err;
        }
    } while ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mov->found_moov && !mov->moov_retry++);
    if (!mov->found_moov) {
        av_log(s, AV_LOG_ERROR, "moov atom not found\n");
        return AVERROR_INVALIDDATA;
    }
    av_log(mov->fc, AV_LOG_TRACE, "on_parse_exit_offset=%"PRId64"\n", avio_tell(pb));

    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
        if (mov->nb_chapter_tracks > 0 && !mov->ignore_chapters)
            mov_read_chapters(s);
        for (i = 0; i < s->nb_streams; i++)
            if (s->streams[i]->codecpar->codec_tag == AV_RL32("tmcd")) {
                mov_read_timecode_track(s, s->streams[i]);
            } else if (s->streams[i]->codecpar->codec_tag == AV_RL32("rtmd")) {
                mov_read_rtmd_track(s, s->streams[i]);
            }
    }

    /* copy timecode metadata from tmcd tracks to the related video streams */
    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        MOVStreamContext *sc = st->priv_data;
        if (sc->timecode_track > 0) {
            AVDictionaryEntry *tcr;
            int tmcd_st_id = -1;

            for (j = 0; j < s->nb_streams; j++)
                if (s->streams[j]->id == sc->timecode_track)
                    tmcd_st_id = j;

            if (tmcd_st_id < 0 || tmcd_st_id == i)
                continue;
            tcr = av_dict_get(s->streams[tmcd_st_id]->metadata, "timecode", NULL, 0);
            if (tcr)
                av_dict_set(&st->metadata, "timecode", tcr->value, 0);
        }
    }
    export_orphan_timecode(s);

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        FFStream *const sti = ffstream(st);
        MOVStreamContext *sc = st->priv_data;
        fix_timescale(mov, sc);
        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
            st->codecpar->codec_id   == AV_CODEC_ID_AAC) {
            sti->skip_samples = sc->start_pad;
        }
        if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sc->nb_frames_for_fps > 0 && sc->duration_for_fps > 0)
            av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
                      sc->time_scale*(int64_t)sc->nb_frames_for_fps, sc->duration_for_fps, INT_MAX);
        if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
            if (st->codecpar->width <= 0 || st->codecpar->height <= 0) {
                st->codecpar->width  = sc->width;
                st->codecpar->height = sc->height;
            }
            if (st->codecpar->codec_id == AV_CODEC_ID_DVD_SUBTITLE) {
                if ((err = mov_rewrite_dvd_sub_extradata(st)) < 0)
                    return err;
            }
        }
        if (mov->handbrake_version &&
            mov->handbrake_version <= 1000000*0 + 1000*10 + 2 &&  // 0.10.2
            st->codecpar->codec_id == AV_CODEC_ID_MP3) {
            av_log(s, AV_LOG_VERBOSE, "Forcing full parsing for mp3 stream\n");
            sti->need_parsing = AVSTREAM_PARSE_FULL;
        }
    }

    if (mov->trex_data) {
        for (i = 0; i < s->nb_streams; i++) {
            AVStream *st = s->streams[i];
            MOVStreamContext *sc = st->priv_data;
            if (st->duration > 0) {
                /* Akin to sc->data_size * 8 * sc->time_scale / st->duration but accounting for overflows. */
                st->codecpar->bit_rate = av_rescale(sc->data_size, ((int64_t) sc->time_scale) * 8, st->duration);
                if (st->codecpar->bit_rate == INT64_MIN) {
                    av_log(s, AV_LOG_WARNING, "Overflow during bit rate calculation %"PRId64" * 8 * %d\n",
                           sc->data_size, sc->time_scale);
                    st->codecpar->bit_rate = 0;
                    if (s->error_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
            }
        }
    }

    if (mov->use_mfra_for > 0) {
        for (i = 0; i < s->nb_streams; i++) {
            AVStream *st = s->streams[i];
            MOVStreamContext *sc = st->priv_data;
            if (sc->duration_for_fps > 0) {
                /* Akin to sc->data_size * 8 * sc->time_scale / sc->duration_for_fps but accounting for overflows. */
                st->codecpar->bit_rate = av_rescale(sc->data_size, ((int64_t) sc->time_scale) * 8, sc->duration_for_fps);
                if (st->codecpar->bit_rate == INT64_MIN) {
                    av_log(s, AV_LOG_WARNING, "Overflow during bit rate calculation %"PRId64" * 8 * %d\n",
                           sc->data_size, sc->time_scale);
                    st->codecpar->bit_rate = 0;
                    if (s->error_recognition & AV_EF_EXPLODE)
                        return AVERROR_INVALIDDATA;
                }
            }
        }
    }

    for (i = 0; i < mov->bitrates_count && i < s->nb_streams; i++) {
        if (mov->bitrates[i]) {
            s->streams[i]->codecpar->bit_rate = mov->bitrates[i];
        }
    }

    ff_rfps_calculate(s);

    for (i = 0; i < s->nb_streams; i++) {
        AVStream *st = s->streams[i];
        MOVStreamContext *sc = st->priv_data;

        switch (st->codecpar->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            err = ff_replaygain_export(st, s->metadata);
            if (err < 0)
                return err;
            break;
        case AVMEDIA_TYPE_VIDEO:
            if (sc->display_matrix) {
                err = av_stream_add_side_data(st, AV_PKT_DATA_DISPLAYMATRIX, (uint8_t*)sc->display_matrix,
                                              sizeof(int32_t) * 9);
                if (err < 0)
                    return err;

                sc->display_matrix = NULL;
            }
            if (sc->stereo3d) {
                err = av_stream_add_side_data(st, AV_PKT_DATA_STEREO3D,
                                              (uint8_t *)sc->stereo3d,
                                              sizeof(*sc->stereo3d));
                if (err < 0)
                    return err;

                sc->stereo3d = NULL;
            }
            if (sc->spherical) {
                err = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL,
                                              (uint8_t *)sc->spherical,
                                              sc->spherical_size);
                if (err < 0)
                    return err;

                sc->spherical = NULL;
            }
            if (sc->mastering) {
                err = av_stream_add_side_data(st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
                                              (uint8_t *)sc->mastering,
                                              sizeof(*sc->mastering));
                if (err < 0)
                    return err;

                sc->mastering = NULL;
            }
            if (sc->coll) {
                err = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
                                              (uint8_t *)sc->coll,
                                              sc->coll_size);
                if (err < 0)
                    return err;

                sc->coll = NULL;
            }
            break;
        }
    }
    ff_configure_buffers_for_index(s, AV_TIME_BASE);

    for (i = 0; i < mov->frag_index.nb_items; i++)
        if (mov->frag_index.item[i].moof_offset <= mov->fragment.moof_offset)
            mov->frag_index.item[i].headers_read = 1;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries, sample_size, field_size, num_bytes;
    GetBitContext gb;
    unsigned char* buf;
    int ret;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    if (atom.type == MKTAG('s','t','s','z')) {
        sample_size = avio_rb32(pb);
        if (!sc->sample_size) /* do not overwrite value computed in stsd */
            sc->sample_size = sample_size;
        sc->stsz_sample_size = sample_size;
        field_size = 32;
    } else {
        sample_size = 0;
        avio_rb24(pb); /* reserved */
        field_size = avio_r8(pb);
    }
    entries = avio_rb32(pb);

    av_log(c->fc, AV_LOG_TRACE, "sample_size = %u sample_count = %u\n", sc->sample_size, entries);

    sc->sample_count = entries;
    if (sample_size)
        return 0;

    if (field_size != 4 && field_size != 8 && field_size != 16 && field_size != 32) {
        av_log(c->fc, AV_LOG_ERROR, "Invalid sample field size %u\n", field_size);
        return AVERROR_INVALIDDATA;
    }

    if (!entries)
        return 0;
    if (entries >= (INT_MAX - 4 - 8 * AV_INPUT_BUFFER_PADDING_SIZE) / field_size)
        return AVERROR_INVALIDDATA;
    if (sc->sample_sizes)
        av_log(c->fc, AV_LOG_WARNING, "Duplicated STSZ atom\n");
    av_free(sc->sample_sizes);
    sc->sample_count = 0;
    sc->sample_sizes = av_malloc_array(entries, sizeof(*sc->sample_sizes));
    if (!sc->sample_sizes)
        return AVERROR(ENOMEM);

    num_bytes = (entries*field_size+4)>>3;

    buf = av_malloc(num_bytes+AV_INPUT_BUFFER_PADDING_SIZE);
    if (!buf) {
        av_freep(&sc->sample_sizes);
        return AVERROR(ENOMEM);
    }

    ret = ffio_read_size(pb, buf, num_bytes);
    if (ret < 0) {
        av_freep(&sc->sample_sizes);
        av_free(buf);
        av_log(c->fc, AV_LOG_WARNING, "STSZ atom truncated\n");
        return 0;
    }

    init_get_bits(&gb, buf, 8*num_bytes);

    for (i = 0; i < entries; i++) {
        sc->sample_sizes[i] = get_bits_long(&gb, field_size);
        if (sc->sample_sizes[i] < 0) {
            av_free(buf);
            av_log(c->fc, AV_LOG_ERROR, "Invalid sample size %d\n", sc->sample_sizes[i]);
            return AVERROR_INVALIDDATA;
        }
        sc->data_size += sc->sample_sizes[i];
    }

    sc->sample_count = i;

    av_free(buf);

    return 0;
}

Project: FFmpeg
File: mov.c

static int rb_size(AVIOContext *pb, uint64_t* value, int size)
{
    if (size == 0)
        *value = 0;
    else if (size == 1)
        *value = avio_r8(pb);
    else if (size == 2)
        *value = avio_rb16(pb);
    else if (size == 4)
        *value = avio_rb32(pb);
    else if (size == 8)
        *value = avio_rb64(pb);
    else
        return -1;
    return size;
}

Project: FFmpeg
File: mov.c

static int mov_read_strf(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    int ret;

    if (c->fc->nb_streams < 1)
        return 0;
    if (atom.size <= 40)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if ((uint64_t)atom.size > (1<<30))
        return AVERROR_INVALIDDATA;

    avio_skip(pb, 40);
    ret = ff_get_extradata(c->fc, st->codecpar, pb, atom.size - 40);
    if (ret < 0)
        return ret;

    return 0;
}

Project: FFmpeg
File: mov.c

static int64_t add_ctts_entry(MOVCtts** ctts_data, unsigned int* ctts_count, unsigned int* allocated_size,
                              int count, int duration)
{
    MOVCtts *ctts_buf_new;
    const size_t min_size_needed = (*ctts_count + 1) * sizeof(MOVCtts);
    const size_t requested_size =
        min_size_needed > *allocated_size ?
        FFMAX(min_size_needed, 2 * (*allocated_size)) :
        min_size_needed;

    if ((unsigned)(*ctts_count) >= UINT_MAX / sizeof(MOVCtts) - 1)
        return -1;

    ctts_buf_new = av_fast_realloc(*ctts_data, allocated_size, requested_size);

    if (!ctts_buf_new)
        return -1;

    *ctts_data = ctts_buf_new;

    ctts_buf_new[*ctts_count].count = count;
    ctts_buf_new[*ctts_count].duration = duration;

    *ctts_count = (*ctts_count) + 1;
    return *ctts_count;
}

Project: FFmpeg
File: mov.c

static int mov_read_senc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVEncryptionInfo **encrypted_samples;
    MOVEncryptionIndex *encryption_index;
    MOVStreamContext *sc;
    int use_subsamples, ret;
    unsigned int sample_count, i, alloc_size = 0;

    ret = get_current_encryption_info(c, &encryption_index, &sc);
    if (ret != 1)
        return ret;

    if (encryption_index->nb_encrypted_samples) {
        // This can happen if we have both saio/saiz and senc atoms.
        av_log(c->fc, AV_LOG_DEBUG, "Ignoring duplicate encryption info in senc\n");
        return 0;
    }

    avio_r8(pb); /* version */
    use_subsamples = avio_rb24(pb) & 0x02; /* flags */

    sample_count = avio_rb32(pb);
    if (sample_count >= INT_MAX / sizeof(*encrypted_samples))
        return AVERROR(ENOMEM);

    for (i = 0; i < sample_count; i++) {
        unsigned int min_samples = FFMIN(FFMAX(i + 1, 1024 * 1024), sample_count);
        encrypted_samples = av_fast_realloc(encryption_index->encrypted_samples, &alloc_size,
                                            min_samples * sizeof(*encrypted_samples));
        if (encrypted_samples) {
            encryption_index->encrypted_samples = encrypted_samples;

            ret = mov_read_sample_encryption_info(
                c, pb, sc, &encryption_index->encrypted_samples[i], use_subsamples);
        } else {
            ret = AVERROR(ENOMEM);
        }
        if (pb->eof_reached) {
            av_log(c->fc, AV_LOG_ERROR, "Hit EOF while reading senc\n");
            if (ret >= 0)
                av_encryption_info_free(encryption_index->encrypted_samples[i]);
            ret = AVERROR_INVALIDDATA;
        }

        if (ret < 0) {
            for (; i > 0; i--)
                av_encryption_info_free(encryption_index->encrypted_samples[i - 1]);
            av_freep(&encryption_index->encrypted_samples);
            return ret;
        }
    }
    encryption_index->nb_encrypted_samples = sample_count;

    return 0;
}

Project: FFmpeg
File: mov.c

static int can_seek_to_key_sample(AVStream *st, int sample, int64_t requested_pts)
{
    MOVStreamContext *sc = st->priv_data;
    FFStream *const sti = ffstream(st);
    int64_t key_sample_dts, key_sample_pts;

    if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
        return 1;

    if (sample >= sc->sample_offsets_count)
        return 1;

    key_sample_dts = sti->index_entries[sample].timestamp;
    key_sample_pts = key_sample_dts + sc->sample_offsets[sample] + sc->dts_shift;

    /*
     * If the sample needs to be presented before an open key sample, they may
     * not be decodable properly, even though they come after in decoding
     * order.
     */
    if (is_open_key_sample(sc, sample) && key_sample_pts > requested_pts)
        return 0;

    return 1;
}

Project: FFmpeg
File: mov.c

static int mov_read_custom(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int64_t end = av_sat_add64(avio_tell(pb), atom.size);
    uint8_t *key = NULL, *val = NULL, *mean = NULL;
    int i;
    int ret = 0;
    AVStream *st;
    MOVStreamContext *sc;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    for (i = 0; i < 3; i++) {
        uint8_t **p;
        uint32_t len, tag;

        if (end - avio_tell(pb) <= 12)
            break;

        len = avio_rb32(pb);
        tag = avio_rl32(pb);
        avio_skip(pb, 4); // flags

        if (len < 12 || len - 12 > end - avio_tell(pb))
            break;
        len -= 12;

        if (tag == MKTAG('m', 'e', 'a', 'n'))
            p = &mean;
        else if (tag == MKTAG('n', 'a', 'm', 'e'))
            p = &key;
        else if (tag == MKTAG('d', 'a', 't', 'a') && len > 4) {
            avio_skip(pb, 4);
            len -= 4;
            p = &val;
        } else
            break;

        if (*p)
            break;

        *p = av_malloc(len + 1);
        if (!*p) {
            ret = AVERROR(ENOMEM);
            break;
        }
        ret = ffio_read_size(pb, *p, len);
        if (ret < 0) {
            av_freep(p);
            break;
        }
        (*p)[len] = 0;
    }

    if (mean && key && val) {
        if (strcmp(key, "iTunSMPB") == 0) {
            int priming, remainder, samples;
            if(sscanf(val, "%*X %X %X %X", &priming, &remainder, &samples) == 3){
                if(priming>0 && priming<16384)
                    sc->start_pad = priming;
            }
        }
        if (strcmp(key, "cdec") != 0) {
            av_dict_set(&c->fc->metadata, key, val,
                        AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);
            key = val = NULL;
        }
    } else {
        av_log(c->fc, AV_LOG_VERBOSE,
               "Unhandled or malformed custom metadata of size %"PRId64"\n", atom.size);
    }

    avio_seek(pb, end, SEEK_SET);
    av_freep(&key);
    av_freep(&val);
    av_freep(&mean);
    return ret;
}

Project: FFmpeg
File: mov.c

static int avif_add_stream(MOVContext *c, int item_id)
{
    MOVStreamContext *sc;
    AVStream *st;
    int item_index = -1;
    for (int i = 0; i < c->avif_info_size; i++)
        if (c->avif_info[i].item_id == item_id) {
            item_index = i;
            break;
        }
    if (item_index < 0)
        return AVERROR_INVALIDDATA;
    st = avformat_new_stream(c->fc, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    st->id = c->fc->nb_streams;
    sc = av_mallocz(sizeof(MOVStreamContext));
    if (!sc)
        return AVERROR(ENOMEM);

    st->priv_data = sc;
    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codecpar->codec_id = AV_CODEC_ID_AV1;
    sc->ffindex = st->index;
    c->trak_index = st->index;
    st->avg_frame_rate.num = st->avg_frame_rate.den = 1;
    st->time_base.num = st->time_base.den = 1;
    st->nb_frames = 1;
    sc->time_scale = 1;
    sc = st->priv_data;
    sc->pb = c->fc->pb;
    sc->pb_is_copied = 1;

    // Populate the necessary fields used by mov_build_index.
    sc->stsc_count = 1;
    sc->stsc_data = av_malloc_array(1, sizeof(*sc->stsc_data));
    if (!sc->stsc_data)
        return AVERROR(ENOMEM);
    sc->stsc_data[0].first = 1;
    sc->stsc_data[0].count = 1;
    sc->stsc_data[0].id = 1;
    sc->chunk_count = 1;
    sc->chunk_offsets = av_malloc_array(1, sizeof(*sc->chunk_offsets));
    if (!sc->chunk_offsets)
        return AVERROR(ENOMEM);
    sc->sample_count = 1;
    sc->sample_sizes = av_malloc_array(1, sizeof(*sc->sample_sizes));
    if (!sc->sample_sizes)
        return AVERROR(ENOMEM);
    sc->stts_count = 1;
    sc->stts_data = av_malloc_array(1, sizeof(*sc->stts_data));
    if (!sc->stts_data)
        return AVERROR(ENOMEM);
    sc->stts_data[0].count = 1;
    // Not used for still images. But needed by mov_build_index.
    sc->stts_data[0].duration = 0;
    sc->sample_sizes[0] = c->avif_info[item_index].extent_length;
    sc->chunk_offsets[0] = c->avif_info[item_index].extent_offset;

    mov_build_index(c, st);
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_mfra(MOVContext *c, AVIOContext *f)
{
    int64_t stream_size = avio_size(f);
    int64_t original_pos = avio_tell(f);
    int64_t seek_ret;
    int ret = -1;
    if ((seek_ret = avio_seek(f, stream_size - 4, SEEK_SET)) < 0) {
        ret = seek_ret;
        goto fail;
    }
    c->mfra_size = avio_rb32(f);
    c->have_read_mfra_size = 1;
    if (!c->mfra_size || c->mfra_size > stream_size) {
        av_log(c->fc, AV_LOG_DEBUG, "doesn't look like mfra (unreasonable size)\n");
        goto fail;
    }
    if ((seek_ret = avio_seek(f, -((int64_t) c->mfra_size), SEEK_CUR)) < 0) {
        ret = seek_ret;
        goto fail;
    }
    if (avio_rb32(f) != c->mfra_size) {
        av_log(c->fc, AV_LOG_DEBUG, "doesn't look like mfra (size mismatch)\n");
        goto fail;
    }
    if (avio_rb32(f) != MKBETAG('m', 'f', 'r', 'a')) {
        av_log(c->fc, AV_LOG_DEBUG, "doesn't look like mfra (tag mismatch)\n");
        goto fail;
    }
    av_log(c->fc, AV_LOG_VERBOSE, "stream has mfra\n");
    do {
        ret = read_tfra(c, f);
        if (ret < 0)
            goto fail;
    } while (!ret);
    ret = 0;
    c->frag_index.complete = 1;
fail:
    seek_ret = avio_seek(f, original_pos, SEEK_SET);
    if (seek_ret < 0) {
        av_log(c->fc, AV_LOG_ERROR,
               "failed to seek back after looking for mfra\n");
        ret = seek_ret;
    }
    return ret;
}

Project: FFmpeg
File: mov.c

static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries, ctts_count = 0;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */
    entries = avio_rb32(pb);

    av_log(c->fc, AV_LOG_TRACE, "track[%u].ctts.entries = %u\n", c->fc->nb_streams - 1, entries);

    if (!entries)
        return 0;
    if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
        return AVERROR_INVALIDDATA;
    av_freep(&sc->ctts_data);
    sc->ctts_data = av_fast_realloc(NULL, &sc->ctts_allocated_size, entries * sizeof(*sc->ctts_data));
    if (!sc->ctts_data)
        return AVERROR(ENOMEM);

    for (i = 0; i < entries && !pb->eof_reached; i++) {
        int count    = avio_rb32(pb);
        int duration = avio_rb32(pb);

        if (count <= 0) {
            av_log(c->fc, AV_LOG_TRACE,
                   "ignoring CTTS entry with count=%d duration=%d\n",
                   count, duration);
            continue;
        }

        add_ctts_entry(&sc->ctts_data, &ctts_count, &sc->ctts_allocated_size,
                       count, duration);

        av_log(c->fc, AV_LOG_TRACE, "count=%d, duration=%d\n",
                count, duration);

        if (FFNABS(duration) < -(1<<28) && i+2<entries) {
            av_log(c->fc, AV_LOG_WARNING, "CTTS invalid\n");
            av_freep(&sc->ctts_data);
            sc->ctts_count = 0;
            return 0;
        }

        if (i+2<entries)
            mov_update_dts_shift(sc, duration, c->fc);
    }

    sc->ctts_count = ctts_count;

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted CTTS atom\n");
        return AVERROR_EOF;
    }

    av_log(c->fc, AV_LOG_TRACE, "dts shift %d\n", sc->dts_shift);

    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_parse_stsd_audio(MOVContext *c, AVIOContext *pb,
                                 AVStream *st, MOVStreamContext *sc)
{
    int bits_per_sample, flags;
    uint16_t version = avio_rb16(pb);
    uint32_t id = 0;
    AVDictionaryEntry *compatible_brands = av_dict_get(c->fc->metadata, "compatible_brands", NULL, AV_DICT_MATCH_CASE);
    int channel_count;

    avio_rb16(pb); /* revision level */
    id = avio_rl32(pb); /* vendor */
    av_dict_set(&st->metadata, "vendor_id", av_fourcc2str(id), 0);

    channel_count = avio_rb16(pb);

    st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
    st->codecpar->ch_layout.nb_channels = channel_count;
    st->codecpar->bits_per_coded_sample = avio_rb16(pb); /* sample size */
    av_log(c->fc, AV_LOG_TRACE, "audio channels %d\n", channel_count);

    sc->audio_cid = avio_rb16(pb);
    avio_rb16(pb); /* packet size = 0 */

    st->codecpar->sample_rate = ((avio_rb32(pb) >> 16));

    // Read QT version 1 fields. In version 0 these do not exist.
    av_log(c->fc, AV_LOG_TRACE, "version =%d, isom =%d\n", version, c->isom);
    if (!c->isom ||
        (compatible_brands && strstr(compatible_brands->value, "qt  ")) ||
        (sc->stsd_version == 0 && version > 0)) {
        if (version == 1) {
            sc->samples_per_frame = avio_rb32(pb);
            avio_rb32(pb); /* bytes per packet */
            sc->bytes_per_frame = avio_rb32(pb);
            avio_rb32(pb); /* bytes per sample */
        } else if (version == 2) {
            avio_rb32(pb); /* sizeof struct only */
            st->codecpar->sample_rate = av_int2double(avio_rb64(pb));
            channel_count = avio_rb32(pb);
            st->codecpar->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
            st->codecpar->ch_layout.nb_channels = channel_count;
            avio_rb32(pb); /* always 0x7F000000 */
            st->codecpar->bits_per_coded_sample = avio_rb32(pb);

            flags = avio_rb32(pb); /* lpcm format specific flag */
            sc->bytes_per_frame   = avio_rb32(pb);
            sc->samples_per_frame = avio_rb32(pb);
            if (st->codecpar->codec_tag == MKTAG('l','p','c','m'))
                st->codecpar->codec_id =
                    ff_mov_get_lpcm_codec_id(st->codecpar->bits_per_coded_sample,
                                             flags);
        }
        if (version == 0 || (version == 1 && sc->audio_cid != -2)) {
            /* can't correctly handle variable sized packet as audio unit */
            switch (st->codecpar->codec_id) {
            case AV_CODEC_ID_MP2:
            case AV_CODEC_ID_MP3:
                ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
                break;
            }
        }
    }

    if (sc->format == 0) {
        if (st->codecpar->bits_per_coded_sample == 8)
            st->codecpar->codec_id = mov_codec_id(st, MKTAG('r','a','w',' '));
        else if (st->codecpar->bits_per_coded_sample == 16)
            st->codecpar->codec_id = mov_codec_id(st, MKTAG('t','w','o','s'));
    }

    switch (st->codecpar->codec_id) {
    case AV_CODEC_ID_PCM_S8:
    case AV_CODEC_ID_PCM_U8:
        if (st->codecpar->bits_per_coded_sample == 16)
            st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
        break;
    case AV_CODEC_ID_PCM_S16LE:
    case AV_CODEC_ID_PCM_S16BE:
        if (st->codecpar->bits_per_coded_sample == 8)
            st->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
        else if (st->codecpar->bits_per_coded_sample == 24)
            st->codecpar->codec_id =
                st->codecpar->codec_id == AV_CODEC_ID_PCM_S16BE ?
                AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
        else if (st->codecpar->bits_per_coded_sample == 32)
             st->codecpar->codec_id =
                st->codecpar->codec_id == AV_CODEC_ID_PCM_S16BE ?
                AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
        break;
    /* set values for old format before stsd version 1 appeared */
    case AV_CODEC_ID_MACE3:
        sc->samples_per_frame = 6;
        sc->bytes_per_frame   = 2 * st->codecpar->ch_layout.nb_channels;
        break;
    case AV_CODEC_ID_MACE6:
        sc->samples_per_frame = 6;
        sc->bytes_per_frame   = 1 * st->codecpar->ch_layout.nb_channels;
        break;
    case AV_CODEC_ID_ADPCM_IMA_QT:
        sc->samples_per_frame = 64;
        sc->bytes_per_frame   = 34 * st->codecpar->ch_layout.nb_channels;
        break;
    case AV_CODEC_ID_GSM:
        sc->samples_per_frame = 160;
        sc->bytes_per_frame   = 33;
        break;
    default:
        break;
    }

    bits_per_sample = av_get_bits_per_sample(st->codecpar->codec_id);
    if (bits_per_sample && (bits_per_sample >> 3) * (uint64_t)st->codecpar->ch_layout.nb_channels <= INT_MAX) {
        st->codecpar->bits_per_coded_sample = bits_per_sample;
        sc->sample_size = (bits_per_sample >> 3) * st->codecpar->ch_layout.nb_channels;
    }
}

Project: FFmpeg
File: mov.c

static void mov_build_index(MOVContext *mov, AVStream *st)
{
    MOVStreamContext *sc = st->priv_data;
    FFStream *const sti = ffstream(st);
    int64_t current_offset;
    int64_t current_dts = 0;
    unsigned int stts_index = 0;
    unsigned int stsc_index = 0;
    unsigned int stss_index = 0;
    unsigned int stps_index = 0;
    unsigned int i, j;
    uint64_t stream_size = 0;
    MOVCtts *ctts_data_old = sc->ctts_data;
    unsigned int ctts_count_old = sc->ctts_count;

    int ret = build_open_gop_key_points(st);
    if (ret < 0)
        return;

    if (sc->elst_count) {
        int i, edit_start_index = 0, multiple_edits = 0;
        int64_t empty_duration = 0; // empty duration of the first edit list entry
        int64_t start_time = 0; // start time of the media

        for (i = 0; i < sc->elst_count; i++) {
            const MOVElst *e = &sc->elst_data[i];
            if (i == 0 && e->time == -1) {
                /* if empty, the first entry is the start time of the stream
                 * relative to the presentation itself */
                empty_duration = e->duration;
                edit_start_index = 1;
            } else if (i == edit_start_index && e->time >= 0) {
                start_time = e->time;
            } else {
                multiple_edits = 1;
            }
        }

        if (multiple_edits && !mov->advanced_editlist)
            av_log(mov->fc, AV_LOG_WARNING, "multiple edit list entries, "
                   "Use -advanced_editlist to correctly decode otherwise "
                   "a/v desync might occur\n");

        /* adjust first dts according to edit list */
        if ((empty_duration || start_time) && mov->time_scale > 0) {
            if (empty_duration)
                empty_duration = av_rescale(empty_duration, sc->time_scale, mov->time_scale);

            if (av_sat_sub64(start_time, empty_duration) != start_time - (uint64_t)empty_duration)
                av_log(mov->fc, AV_LOG_WARNING, "start_time - empty_duration is not representable\n");

            sc->time_offset = start_time -  (uint64_t)empty_duration;
            sc->min_corrected_pts = start_time;
            if (!mov->advanced_editlist)
                current_dts = -sc->time_offset;
        }

        if (!multiple_edits && !mov->advanced_editlist &&
            st->codecpar->codec_id == AV_CODEC_ID_AAC && start_time > 0)
            sc->start_pad = start_time;
    }

    /* only use old uncompressed audio chunk demuxing when stts specifies it */
    if (!(st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
          sc->stts_count == 1 && sc->stts_data[0].duration == 1)) {
        unsigned int current_sample = 0;
        unsigned int stts_sample = 0;
        unsigned int sample_size;
        unsigned int distance = 0;
        unsigned int rap_group_index = 0;
        unsigned int rap_group_sample = 0;
        int rap_group_present = sc->rap_group_count && sc->rap_group;
        int key_off = (sc->keyframe_count && sc->keyframes[0] > 0) || (sc->stps_count && sc->stps_data[0] > 0);

        current_dts -= sc->dts_shift;

        if (!sc->sample_count || sti->nb_index_entries)
            return;
        if (sc->sample_count >= UINT_MAX / sizeof(*sti->index_entries) - sti->nb_index_entries)
            return;
        if (av_reallocp_array(&sti->index_entries,
                              sti->nb_index_entries + sc->sample_count,
                              sizeof(*sti->index_entries)) < 0) {
            sti->nb_index_entries = 0;
            return;
        }
        sti->index_entries_allocated_size = (sti->nb_index_entries + sc->sample_count) * sizeof(*sti->index_entries);

        if (ctts_data_old) {
            // Expand ctts entries such that we have a 1-1 mapping with samples
            if (sc->sample_count >= UINT_MAX / sizeof(*sc->ctts_data))
                return;
            sc->ctts_count = 0;
            sc->ctts_allocated_size = 0;
            sc->ctts_data = av_fast_realloc(NULL, &sc->ctts_allocated_size,
                                    sc->sample_count * sizeof(*sc->ctts_data));
            if (!sc->ctts_data) {
                av_free(ctts_data_old);
                return;
            }

            memset((uint8_t*)(sc->ctts_data), 0, sc->ctts_allocated_size);

            for (i = 0; i < ctts_count_old &&
                        sc->ctts_count < sc->sample_count; i++)
                for (j = 0; j < ctts_data_old[i].count &&
                            sc->ctts_count < sc->sample_count; j++)
                    add_ctts_entry(&sc->ctts_data, &sc->ctts_count,
                                   &sc->ctts_allocated_size, 1,
                                   ctts_data_old[i].duration);
            av_free(ctts_data_old);
        }

        for (i = 0; i < sc->chunk_count; i++) {
            int64_t next_offset = i+1 < sc->chunk_count ? sc->chunk_offsets[i+1] : INT64_MAX;
            current_offset = sc->chunk_offsets[i];
            while (mov_stsc_index_valid(stsc_index, sc->stsc_count) &&
                i + 1 == sc->stsc_data[stsc_index + 1].first)
                stsc_index++;

            if (next_offset > current_offset && sc->sample_size>0 && sc->sample_size < sc->stsz_sample_size &&
                sc->stsc_data[stsc_index].count * (int64_t)sc->stsz_sample_size > next_offset - current_offset) {
                av_log(mov->fc, AV_LOG_WARNING, "STSZ sample size %d invalid (too large), ignoring\n", sc->stsz_sample_size);
                sc->stsz_sample_size = sc->sample_size;
            }
            if (sc->stsz_sample_size>0 && sc->stsz_sample_size < sc->sample_size) {
                av_log(mov->fc, AV_LOG_WARNING, "STSZ sample size %d invalid (too small), ignoring\n", sc->stsz_sample_size);
                sc->stsz_sample_size = sc->sample_size;
            }

            for (j = 0; j < sc->stsc_data[stsc_index].count; j++) {
                int keyframe = 0;
                if (current_sample >= sc->sample_count) {
                    av_log(mov->fc, AV_LOG_ERROR, "wrong sample count\n");
                    return;
                }

                if (!sc->keyframe_absent && (!sc->keyframe_count || current_sample+key_off == sc->keyframes[stss_index])) {
                    keyframe = 1;
                    if (stss_index + 1 < sc->keyframe_count)
                        stss_index++;
                } else if (sc->stps_count && current_sample+key_off == sc->stps_data[stps_index]) {
                    keyframe = 1;
                    if (stps_index + 1 < sc->stps_count)
                        stps_index++;
                }
                if (rap_group_present && rap_group_index < sc->rap_group_count) {
                    if (sc->rap_group[rap_group_index].index > 0)
                        keyframe = 1;
                    if (++rap_group_sample == sc->rap_group[rap_group_index].count) {
                        rap_group_sample = 0;
                        rap_group_index++;
                    }
                }
                if (sc->keyframe_absent
                    && !sc->stps_count
                    && !rap_group_present
                    && (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || (i==0 && j==0)))
                     keyframe = 1;
                if (keyframe)
                    distance = 0;
                sample_size = sc->stsz_sample_size > 0 ? sc->stsz_sample_size : sc->sample_sizes[current_sample];
                if (sc->pseudo_stream_id == -1 ||
                   sc->stsc_data[stsc_index].id - 1 == sc->pseudo_stream_id) {
                    AVIndexEntry *e;
                    if (sample_size > 0x3FFFFFFF) {
                        av_log(mov->fc, AV_LOG_ERROR, "Sample size %u is too large\n", sample_size);
                        return;
                    }
                    e = &sti->index_entries[sti->nb_index_entries++];
                    e->pos = current_offset;
                    e->timestamp = current_dts;
                    e->size = sample_size;
                    e->min_distance = distance;
                    e->flags = keyframe ? AVINDEX_KEYFRAME : 0;
                    av_log(mov->fc, AV_LOG_TRACE, "AVIndex stream %d, sample %u, offset %"PRIx64", dts %"PRId64", "
                            "size %u, distance %u, keyframe %d\n", st->index, current_sample,
                            current_offset, current_dts, sample_size, distance, keyframe);
                    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sti->nb_index_entries < 100)
                        ff_rfps_add_frame(mov->fc, st, current_dts);
                }

                current_offset += sample_size;
                stream_size += sample_size;

                current_dts += sc->stts_data[stts_index].duration;

                distance++;
                stts_sample++;
                current_sample++;
                if (stts_index + 1 < sc->stts_count && stts_sample == sc->stts_data[stts_index].count) {
                    stts_sample = 0;
                    stts_index++;
                }
            }
        }
        if (st->duration > 0)
            st->codecpar->bit_rate = stream_size*8*sc->time_scale/st->duration;
    } else {
        unsigned chunk_samples, total = 0;

        if (!sc->chunk_count)
            return;

        // compute total chunk count
        for (i = 0; i < sc->stsc_count; i++) {
            unsigned count, chunk_count;

            chunk_samples = sc->stsc_data[i].count;
            if (i != sc->stsc_count - 1 &&
                sc->samples_per_frame && chunk_samples % sc->samples_per_frame) {
                av_log(mov->fc, AV_LOG_ERROR, "error unaligned chunk\n");
                return;
            }

            if (sc->samples_per_frame >= 160) { // gsm
                count = chunk_samples / sc->samples_per_frame;
            } else if (sc->samples_per_frame > 1) {
                unsigned samples = (1024/sc->samples_per_frame)*sc->samples_per_frame;
                count = (chunk_samples+samples-1) / samples;
            } else {
                count = (chunk_samples+1023) / 1024;
            }

            if (mov_stsc_index_valid(i, sc->stsc_count))
                chunk_count = sc->stsc_data[i+1].first - sc->stsc_data[i].first;
            else
                chunk_count = sc->chunk_count - (sc->stsc_data[i].first - 1);
            total += chunk_count * count;
        }

        av_log(mov->fc, AV_LOG_TRACE, "chunk count %u\n", total);
        if (total >= UINT_MAX / sizeof(*sti->index_entries) - sti->nb_index_entries)
            return;
        if (av_reallocp_array(&sti->index_entries,
                              sti->nb_index_entries + total,
                              sizeof(*sti->index_entries)) < 0) {
            sti->nb_index_entries = 0;
            return;
        }
        sti->index_entries_allocated_size = (sti->nb_index_entries + total) * sizeof(*sti->index_entries);

        // populate index
        for (i = 0; i < sc->chunk_count; i++) {
            current_offset = sc->chunk_offsets[i];
            if (mov_stsc_index_valid(stsc_index, sc->stsc_count) &&
                i + 1 == sc->stsc_data[stsc_index + 1].first)
                stsc_index++;
            chunk_samples = sc->stsc_data[stsc_index].count;

            while (chunk_samples > 0) {
                AVIndexEntry *e;
                unsigned size, samples;

                if (sc->samples_per_frame > 1 && !sc->bytes_per_frame) {
                    avpriv_request_sample(mov->fc,
                           "Zero bytes per frame, but %d samples per frame",
                           sc->samples_per_frame);
                    return;
                }

                if (sc->samples_per_frame >= 160) { // gsm
                    samples = sc->samples_per_frame;
                    size = sc->bytes_per_frame;
                } else {
                    if (sc->samples_per_frame > 1) {
                        samples = FFMIN((1024 / sc->samples_per_frame)*
                                        sc->samples_per_frame, chunk_samples);
                        size = (samples / sc->samples_per_frame) * sc->bytes_per_frame;
                    } else {
                        samples = FFMIN(1024, chunk_samples);
                        size = samples * sc->sample_size;
                    }
                }

                if (sti->nb_index_entries >= total) {
                    av_log(mov->fc, AV_LOG_ERROR, "wrong chunk count %u\n", total);
                    return;
                }
                if (size > 0x3FFFFFFF) {
                    av_log(mov->fc, AV_LOG_ERROR, "Sample size %u is too large\n", size);
                    return;
                }
                e = &sti->index_entries[sti->nb_index_entries++];
                e->pos = current_offset;
                e->timestamp = current_dts;
                e->size = size;
                e->min_distance = 0;
                e->flags = AVINDEX_KEYFRAME;
                av_log(mov->fc, AV_LOG_TRACE, "AVIndex stream %d, chunk %u, offset %"PRIx64", dts %"PRId64", "
                       "size %u, duration %u\n", st->index, i, current_offset, current_dts,
                       size, samples);

                current_offset += size;
                current_dts += samples;
                chunk_samples -= samples;
            }
        }
    }

    if (!mov->ignore_editlist && mov->advanced_editlist) {
        // Fix index according to edit lists.
        mov_fix_index(mov, st);
    }

    // Update start time of the stream.
    if (st->start_time == AV_NOPTS_VALUE && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sti->nb_index_entries > 0) {
        st->start_time = sti->index_entries[0].timestamp + sc->dts_shift;
        if (sc->ctts_data) {
            st->start_time += sc->ctts_data[0].duration;
        }
    }

    mov_estimate_video_delay(mov, st);
}

Project: FFmpeg
File: mov.c

static int cenc_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryptionInfo *sample, uint8_t *input, int size)
{
    if (sample->scheme == MKBETAG('c','e','n','c') && !sample->crypt_byte_block && !sample->skip_byte_block) {
        return cenc_scheme_decrypt(c, sc, sample, input, size);
    } else if (sample->scheme == MKBETAG('c','b','c','1') && !sample->crypt_byte_block && !sample->skip_byte_block) {
        return cbc1_scheme_decrypt(c, sc, sample, input, size);
    } else if (sample->scheme == MKBETAG('c','e','n','s')) {
        return cens_scheme_decrypt(c, sc, sample, input, size);
    } else if (sample->scheme == MKBETAG('c','b','c','s')) {
        return cbcs_scheme_decrypt(c, sc, sample, input, size);
    } else {
        av_log(c->fc, AV_LOG_ERROR, "invalid encryption scheme\n");
        return AVERROR_INVALIDDATA;
    }
}

Project: FFmpeg
File: mov.c

static int cenc_filter(MOVContext *mov, AVStream* st, MOVStreamContext *sc, AVPacket *pkt, int current_index)
{
    MOVFragmentStreamInfo *frag_stream_info;
    MOVEncryptionIndex *encryption_index;
    AVEncryptionInfo *encrypted_sample;
    int encrypted_index, ret;

    frag_stream_info = get_frag_stream_info_from_pkt(&mov->frag_index, pkt, st->id);
    encrypted_index = current_index;
    encryption_index = NULL;
    if (frag_stream_info) {
        // Note this only supports encryption info in the first sample descriptor.
        if (mov->fragment.stsd_id == 1) {
            if (frag_stream_info->encryption_index) {
                encrypted_index = current_index - frag_stream_info->index_base;
                encryption_index = frag_stream_info->encryption_index;
            } else {
                encryption_index = sc->cenc.encryption_index;
            }
        }
    } else {
        encryption_index = sc->cenc.encryption_index;
    }

    if (encryption_index) {
        if (encryption_index->auxiliary_info_sample_count &&
            !encryption_index->nb_encrypted_samples) {
            av_log(mov->fc, AV_LOG_ERROR, "saiz atom found without saio\n");
            return AVERROR_INVALIDDATA;
        }
        if (encryption_index->auxiliary_offsets_count &&
            !encryption_index->nb_encrypted_samples) {
            av_log(mov->fc, AV_LOG_ERROR, "saio atom found without saiz\n");
            return AVERROR_INVALIDDATA;
        }

        if (!encryption_index->nb_encrypted_samples) {
            // Full-sample encryption with default settings.
            encrypted_sample = sc->cenc.default_encrypted_sample;
        } else if (encrypted_index >= 0 && encrypted_index < encryption_index->nb_encrypted_samples) {
            // Per-sample setting override.
            encrypted_sample = encryption_index->encrypted_samples[encrypted_index];
        } else {
            av_log(mov->fc, AV_LOG_ERROR, "Incorrect number of samples in encryption info\n");
            return AVERROR_INVALIDDATA;
        }

        if (mov->decryption_key) {
            return cenc_decrypt(mov, sc, encrypted_sample, pkt->data, pkt->size);
        } else {
            size_t size;
            uint8_t *side_data = av_encryption_info_add_side_data(encrypted_sample, &size);
            if (!side_data)
                return AVERROR(ENOMEM);
            ret = av_packet_add_side_data(pkt, AV_PKT_DATA_ENCRYPTION_INFO, side_data, size);
            if (ret < 0)
                av_free(side_data);
            return ret;
        }
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_dec3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    enum AVAudioServiceType *ast;
    int eac3info, acmod, lfeon, bsmod;
    uint64_t mask;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    ast = (enum AVAudioServiceType*)av_stream_new_side_data(st, AV_PKT_DATA_AUDIO_SERVICE_TYPE,
                                                            sizeof(*ast));
    if (!ast)
        return AVERROR(ENOMEM);

    /* No need to parse fields for additional independent substreams and its
     * associated dependent substreams since libavcodec's E-AC-3 decoder
     * does not support them yet. */
    avio_rb16(pb); /* data_rate and num_ind_sub */
    eac3info = avio_rb24(pb);
    bsmod = (eac3info >> 12) & 0x1f;
    acmod = (eac3info >>  9) & 0x7;
    lfeon = (eac3info >>  8) & 0x1;

    mask = ff_ac3_channel_layout_tab[acmod];
    if (lfeon)
        mask |= AV_CH_LOW_FREQUENCY;
    av_channel_layout_uninit(&st->codecpar->ch_layout);
    av_channel_layout_from_mask(&st->codecpar->ch_layout, mask);

    *ast = bsmod;
    if (st->codecpar->ch_layout.nb_channels > 1 && bsmod == 0x7)
        *ast = AV_AUDIO_SERVICE_TYPE_KARAOKE;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_SAND(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    int version;

    if (c->fc->nb_streams < 1)
        return 0;

    st = c->fc->streams[c->fc->nb_streams - 1];

    if (atom.size < 5) {
        av_log(c->fc, AV_LOG_ERROR, "Empty SAND audio box\n");
        return AVERROR_INVALIDDATA;
    }

    version = avio_r8(pb);
    if (version) {
        av_log(c->fc, AV_LOG_WARNING, "Unsupported SAND box version %d\n", version);
        return 0;
    }

    st->disposition |= AV_DISPOSITION_NON_DIEGETIC;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_glbl(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    int ret;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if ((uint64_t)atom.size > (1<<30))
        return AVERROR_INVALIDDATA;

    if (atom.size >= 10) {
        // Broken files created by legacy versions of libavformat will
        // wrap a whole fiel atom inside of a glbl atom.
        unsigned size = avio_rb32(pb);
        unsigned type = avio_rl32(pb);
        if (avio_feof(pb))
            return AVERROR_INVALIDDATA;
        avio_seek(pb, -8, SEEK_CUR);
        if (type == MKTAG('f','i','e','l') && size == atom.size)
            return mov_read_default(c, pb, atom);
    }
    if (st->codecpar->extradata_size > 1 && st->codecpar->extradata) {
        av_log(c->fc, AV_LOG_WARNING, "ignoring multiple glbl\n");
        return 0;
    }
    ret = ff_get_extradata(c->fc, st->codecpar, pb, atom.size);
    if (ret < 0)
        return ret;
    if (atom.type == MKTAG('h','v','c','C') && st->codecpar->codec_tag == MKTAG('d','v','h','1'))
        /* HEVC-based Dolby Vision derived from hvc1.
           Happens to match with an identifier
           previously utilized for DV. Thus, if we have
           the hvcC extradata box available as specified,
           set codec to HEVC */
        st->codecpar->codec_id = AV_CODEC_ID_HEVC;

    return 0;
}

Project: FFmpeg
File: mov.c

static int search_frag_moof_offset(MOVFragmentIndex *frag_index, int64_t offset)
{
    int a, b, m;
    int64_t moof_offset;

    // Optimize for appending new entries
    if (!frag_index->nb_items ||
        frag_index->item[frag_index->nb_items - 1].moof_offset < offset)
        return frag_index->nb_items;

    a = -1;
    b = frag_index->nb_items;

    while (b - a > 1) {
        m = (a + b) >> 1;
        moof_offset = frag_index->item[m].moof_offset;
        if (moof_offset >= offset)
            b = m;
        if (moof_offset <= offset)
            a = m;
    }
    return b;
}

Project: FFmpeg
File: mov.c

static int mov_read_adrm(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    uint8_t intermediate_key[20];
    uint8_t intermediate_iv[20];
    uint8_t input[64];
    uint8_t output[64];
    uint8_t file_checksum[20];
    uint8_t calculated_checksum[20];
    char checksum_string[2 * sizeof(file_checksum) + 1];
    struct AVSHA *sha;
    int i;
    int ret = 0;
    uint8_t *activation_bytes = c->activation_bytes;
    uint8_t *fixed_key = c->audible_fixed_key;

    c->aax_mode = 1;

    sha = av_sha_alloc();
    if (!sha)
        return AVERROR(ENOMEM);
    av_free(c->aes_decrypt);
    c->aes_decrypt = av_aes_alloc();
    if (!c->aes_decrypt) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    /* drm blob processing */
    avio_read(pb, output, 8); // go to offset 8, absolute position 0x251
    avio_read(pb, input, DRM_BLOB_SIZE);
    avio_read(pb, output, 4); // go to offset 4, absolute position 0x28d
    avio_read(pb, file_checksum, 20);

    // required by external tools
    ff_data_to_hex(checksum_string, file_checksum, sizeof(file_checksum), 1);
    av_log(c->fc, AV_LOG_INFO, "[aax] file checksum == %s\n", checksum_string);

    /* verify activation data */
    if (!activation_bytes) {
        av_log(c->fc, AV_LOG_WARNING, "[aax] activation_bytes option is missing!\n");
        ret = 0;  /* allow ffprobe to continue working on .aax files */
        goto fail;
    }
    if (c->activation_bytes_size != 4) {
        av_log(c->fc, AV_LOG_FATAL, "[aax] activation_bytes value needs to be 4 bytes!\n");
        ret = AVERROR(EINVAL);
        goto fail;
    }

    /* verify fixed key */
    if (c->audible_fixed_key_size != 16) {
        av_log(c->fc, AV_LOG_FATAL, "[aax] audible_fixed_key value needs to be 16 bytes!\n");
        ret = AVERROR(EINVAL);
        goto fail;
    }

    /* AAX (and AAX+) key derivation */
    av_sha_init(sha, 160);
    av_sha_update(sha, fixed_key, 16);
    av_sha_update(sha, activation_bytes, 4);
    av_sha_final(sha, intermediate_key);
    av_sha_init(sha, 160);
    av_sha_update(sha, fixed_key, 16);
    av_sha_update(sha, intermediate_key, 20);
    av_sha_update(sha, activation_bytes, 4);
    av_sha_final(sha, intermediate_iv);
    av_sha_init(sha, 160);
    av_sha_update(sha, intermediate_key, 16);
    av_sha_update(sha, intermediate_iv, 16);
    av_sha_final(sha, calculated_checksum);
    if (memcmp(calculated_checksum, file_checksum, 20)) { // critical error
        av_log(c->fc, AV_LOG_ERROR, "[aax] mismatch in checksums!\n");
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }
    av_aes_init(c->aes_decrypt, intermediate_key, 128, 1);
    av_aes_crypt(c->aes_decrypt, output, input, DRM_BLOB_SIZE >> 4, intermediate_iv, 1);
    for (i = 0; i < 4; i++) {
        // file data (in output) is stored in big-endian mode
        if (activation_bytes[i] != output[3 - i]) { // critical error
            av_log(c->fc, AV_LOG_ERROR, "[aax] error in drm blob decryption!\n");
            ret = AVERROR_INVALIDDATA;
            goto fail;
        }
    }
    memcpy(c->file_key, output + 8, 16);
    memcpy(input, output + 26, 16);
    av_sha_init(sha, 160);
    av_sha_update(sha, input, 16);
    av_sha_update(sha, c->file_key, 16);
    av_sha_update(sha, fixed_key, 16);
    av_sha_final(sha, c->file_iv);

fail:
    av_free(sha);

    return ret;
}

Project: FFmpeg
File: mov.c

static int mov_read_pasp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    const int num = avio_rb32(pb);
    const int den = avio_rb32(pb);
    AVStream *st;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if (den != 0) {
        av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
                  num, den, 32767);
    }
    return 0;
}

Project: FFmpeg
File: mov.c

static int cens_scheme_decrypt(MOVContext *c, MOVStreamContext *sc, AVEncryptionInfo *sample, uint8_t *input, int size)
{
    int i, ret, rem_bytes;
    uint8_t *data;

    if (!sc->cenc.aes_ctr) {
        /* initialize the cipher */
        sc->cenc.aes_ctr = av_aes_ctr_alloc();
        if (!sc->cenc.aes_ctr) {
            return AVERROR(ENOMEM);
        }

        ret = av_aes_ctr_init(sc->cenc.aes_ctr, c->decryption_key);
        if (ret < 0) {
            return ret;
        }
    }

    av_aes_ctr_set_full_iv(sc->cenc.aes_ctr, sample->iv);

    /* whole-block full sample encryption */
    if (!sample->subsample_count) {
        /* decrypt the whole packet */
        av_aes_ctr_crypt(sc->cenc.aes_ctr, input, input, size);
        return 0;
    } else if (!sample->crypt_byte_block && !sample->skip_byte_block) {
        av_log(c->fc, AV_LOG_ERROR, "pattern encryption is not present in 'cens' scheme\n");
        return AVERROR_INVALIDDATA;
    }

    for (i = 0; i < sample->subsample_count; i++) {
        if (sample->subsamples[i].bytes_of_clear_data + sample->subsamples[i].bytes_of_protected_data > size) {
            av_log(c->fc, AV_LOG_ERROR, "subsample size exceeds the packet size left\n");
            return AVERROR_INVALIDDATA;
        }

        /* skip the clear bytes */
        input += sample->subsamples[i].bytes_of_clear_data;
        size -= sample->subsamples[i].bytes_of_clear_data;

        /* decrypt the encrypted bytes */
        data = input;
        rem_bytes = sample->subsamples[i].bytes_of_protected_data;
        while (rem_bytes > 0) {
            if (rem_bytes < 16*sample->crypt_byte_block) {
                break;
            }
            av_aes_ctr_crypt(sc->cenc.aes_ctr, data, data, 16*sample->crypt_byte_block);
            data += 16*sample->crypt_byte_block;
            rem_bytes -= 16*sample->crypt_byte_block;
            data += FFMIN(16*sample->skip_byte_block, rem_bytes);
            rem_bytes -= FFMIN(16*sample->skip_byte_block, rem_bytes);
        }
        input += sample->subsamples[i].bytes_of_protected_data;
        size -= sample->subsamples[i].bytes_of_protected_data;
    }

    if (size > 0) {
        av_log(c->fc, AV_LOG_ERROR, "leftover packet bytes after subsample processing\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int get_current_encryption_info(MOVContext *c, MOVEncryptionIndex **encryption_index, MOVStreamContext **sc)
{
    MOVFragmentStreamInfo *frag_stream_info;
    AVStream *st;
    int i;

    frag_stream_info = get_current_frag_stream_info(&c->frag_index);
    if (frag_stream_info) {
        for (i = 0; i < c->fc->nb_streams; i++) {
            if (c->fc->streams[i]->id == frag_stream_info->id) {
              st = c->fc->streams[i];
              break;
            }
        }
        if (i == c->fc->nb_streams)
            return 0;
        *sc = st->priv_data;

        if (!frag_stream_info->encryption_index) {
            // If this stream isn't encrypted, don't create the index.
            if (!(*sc)->cenc.default_encrypted_sample)
                return 0;
            frag_stream_info->encryption_index = av_mallocz(sizeof(*frag_stream_info->encryption_index));
            if (!frag_stream_info->encryption_index)
                return AVERROR(ENOMEM);
        }
        *encryption_index = frag_stream_info->encryption_index;
        return 1;
    } else {
        // No current track fragment, using stream level encryption info.

        if (c->fc->nb_streams < 1)
            return 0;
        st = c->fc->streams[c->fc->nb_streams - 1];
        *sc = st->priv_data;

        if (!(*sc)->cenc.encryption_index) {
            // If this stream isn't encrypted, don't create the index.
            if (!(*sc)->cenc.default_encrypted_sample)
                return 0;
            (*sc)->cenc.encryption_index = av_mallocz(sizeof(*frag_stream_info->encryption_index));
            if (!(*sc)->cenc.encryption_index)
                return AVERROR(ENOMEM);
        }

        *encryption_index = (*sc)->cenc.encryption_index;
        return 1;
    }
}

Project: FFmpeg
File: mov.c

static int is_open_key_sample(const MOVStreamContext *sc, int sample)
{
    // TODO: a bisect search would scale much better
    for (int i = 0; i < sc->open_key_samples_count; i++) {
        const int oks = sc->open_key_samples[i];
        if (oks == sample)
            return 1;
        if (oks > sample) /* list is monotically increasing so we can stop early */
            break;
    }
    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_dac3(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    enum AVAudioServiceType *ast;
    int ac3info, acmod, lfeon, bsmod;
    uint64_t mask;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    ast = (enum AVAudioServiceType*)av_stream_new_side_data(st, AV_PKT_DATA_AUDIO_SERVICE_TYPE,
                                                            sizeof(*ast));
    if (!ast)
        return AVERROR(ENOMEM);

    ac3info = avio_rb24(pb);
    bsmod = (ac3info >> 14) & 0x7;
    acmod = (ac3info >> 11) & 0x7;
    lfeon = (ac3info >> 10) & 0x1;

    mask = ff_ac3_channel_layout_tab[acmod];
    if (lfeon)
        mask |= AV_CH_LOW_FREQUENCY;
    av_channel_layout_uninit(&st->codecpar->ch_layout);
    av_channel_layout_from_mask(&st->codecpar->ch_layout, mask);

    *ast = bsmod;
    if (st->codecpar->ch_layout.nb_channels > 1 && bsmod == 0x7)
        *ast = AV_AUDIO_SERVICE_TYPE_KARAOKE;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_stsd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    int ret, entries;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams - 1];
    sc = st->priv_data;

    sc->stsd_version = avio_r8(pb);
    avio_rb24(pb); /* flags */
    entries = avio_rb32(pb);

    /* Each entry contains a size (4 bytes) and format (4 bytes). */
    if (entries <= 0 || entries > atom.size / 8 || entries > 1024) {
        av_log(c->fc, AV_LOG_ERROR, "invalid STSD entries %d\n", entries);
        return AVERROR_INVALIDDATA;
    }

    if (sc->extradata) {
        av_log(c->fc, AV_LOG_ERROR,
               "Duplicate stsd found in this track.\n");
        return AVERROR_INVALIDDATA;
    }

    /* Prepare space for hosting multiple extradata. */
    sc->extradata = av_calloc(entries, sizeof(*sc->extradata));
    if (!sc->extradata)
        return AVERROR(ENOMEM);

    sc->extradata_size = av_calloc(entries, sizeof(*sc->extradata_size));
    if (!sc->extradata_size) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    ret = ff_mov_read_stsd_entries(c, pb, entries);
    if (ret < 0)
        goto fail;

    /* Restore back the primary extradata. */
    av_freep(&st->codecpar->extradata);
    st->codecpar->extradata_size = sc->extradata_size[0];
    if (sc->extradata_size[0]) {
        st->codecpar->extradata = av_mallocz(sc->extradata_size[0] + AV_INPUT_BUFFER_PADDING_SIZE);
        if (!st->codecpar->extradata)
            return AVERROR(ENOMEM);
        memcpy(st->codecpar->extradata, sc->extradata[0], sc->extradata_size[0]);
    }

    return mov_finalize_stsd_codec(c, pb, st, sc);
fail:
    if (sc->extradata) {
        int j;
        for (j = 0; j < sc->stsd_count; j++)
            av_freep(&sc->extradata[j]);
    }

    av_freep(&sc->extradata);
    av_freep(&sc->extradata_size);
    return ret;
}

Project: FFmpeg
File: mov.c

static int64_t mov_get_skip_samples(AVStream *st, int sample)
{
    MOVStreamContext *sc = st->priv_data;
    FFStream *const sti = ffstream(st);
    int64_t first_ts = sti->index_entries[0].timestamp;
    int64_t ts = sti->index_entries[sample].timestamp;
    int64_t off;

    if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
        return 0;

    /* compute skip samples according to stream start_pad, seek ts and first ts */
    off = av_rescale_q(ts - first_ts, st->time_base,
                       (AVRational){1, st->codecpar->sample_rate});
    return FFMAX(sc->start_pad - off, 0);
}

Project: FFmpeg
File: mov.c

static int mov_rewrite_dvd_sub_extradata(AVStream *st)
{
    char buf[256] = {0};
    uint8_t *src = st->codecpar->extradata;
    int i, ret;

    if (st->codecpar->extradata_size != 64)
        return 0;

    if (st->codecpar->width > 0 &&  st->codecpar->height > 0)
        snprintf(buf, sizeof(buf), "size: %dx%d\n",
                 st->codecpar->width, st->codecpar->height);
    av_strlcat(buf, "palette: ", sizeof(buf));

    for (i = 0; i < 16; i++) {
        uint32_t yuv = AV_RB32(src + i * 4);
        uint32_t rgba = yuv_to_rgba(yuv);

        av_strlcatf(buf, sizeof(buf), "%06"PRIx32"%s", rgba, i != 15 ? ", " : "");
    }

    if (av_strlcat(buf, "\n", sizeof(buf)) >= sizeof(buf))
        return 0;

    ret = ff_alloc_extradata(st->codecpar, strlen(buf));
    if (ret < 0)
        return ret;
    memcpy(st->codecpar->extradata, buf, st->codecpar->extradata_size);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVFragment *frag = &c->fragment;
    MOVTrackExt *trex = NULL;
    int flags, track_id, i;
    MOVFragmentStreamInfo * frag_stream_info;

    avio_r8(pb); /* version */
    flags = avio_rb24(pb);

    track_id = avio_rb32(pb);
    if (!track_id)
        return AVERROR_INVALIDDATA;
    for (i = 0; i < c->trex_count; i++)
        if (c->trex_data[i].track_id == track_id) {
            trex = &c->trex_data[i];
            break;
        }
    if (!trex) {
        av_log(c->fc, AV_LOG_WARNING, "could not find corresponding trex (id %u)\n", track_id);
        return 0;
    }
    c->fragment.found_tfhd = 1;
    frag->track_id = track_id;
    set_frag_stream(&c->frag_index, track_id);

    frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
                             avio_rb64(pb) : flags & MOV_TFHD_DEFAULT_BASE_IS_MOOF ?
                             frag->moof_offset : frag->implicit_offset;
    frag->stsd_id  = flags & MOV_TFHD_STSD_ID ? avio_rb32(pb) : trex->stsd_id;

    frag->duration = flags & MOV_TFHD_DEFAULT_DURATION ?
                     avio_rb32(pb) : trex->duration;
    frag->size     = flags & MOV_TFHD_DEFAULT_SIZE ?
                     avio_rb32(pb) : trex->size;
    frag->flags    = flags & MOV_TFHD_DEFAULT_FLAGS ?
                     avio_rb32(pb) : trex->flags;
    av_log(c->fc, AV_LOG_TRACE, "frag flags 0x%x\n", frag->flags);

    frag_stream_info = get_current_frag_stream_info(&c->frag_index);
    if (frag_stream_info)
        frag_stream_info->next_trun_dts = AV_NOPTS_VALUE;

    return 0;
}

Project: FFmpeg
File: mov.c

static MOVFragmentStreamInfo * get_frag_stream_info(
    MOVFragmentIndex *frag_index,
    int index,
    int id)
{
    int i;
    MOVFragmentIndexItem * item;

    if (index < 0 || index >= frag_index->nb_items)
        return NULL;
    item = &frag_index->item[index];
    for (i = 0; i < item->nb_stream_info; i++)
        if (item->stream_info[i].id == id)
            return &item->stream_info[i];

    // This shouldn't happen
    return NULL;
}

Project: FFmpeg
File: mov.c

static void mov_free_encryption_index(MOVEncryptionIndex **index) {
    int i;
    if (!index || !*index) return;
    for (i = 0; i < (*index)->nb_encrypted_samples; i++) {
        av_encryption_info_free((*index)->encrypted_samples[i]);
    }
    av_freep(&(*index)->encrypted_samples);
    av_freep(&(*index)->auxiliary_info_sizes);
    av_freep(&(*index)->auxiliary_offsets);
    av_freep(index);
}

Project: FFmpeg
File: mov.c

static int mov_read_avid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    int ret = mov_read_extradata(c, pb, atom, AV_CODEC_ID_AVUI);
    if (!ret)
        ret = mov_read_extradata(c, pb, atom, AV_CODEC_ID_DNXHD);
    return ret;
}

Project: FFmpeg
File: mov.c

static int mov_read_trak(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    int ret;

    st = avformat_new_stream(c->fc, NULL);
    if (!st) return AVERROR(ENOMEM);
    st->id = -1;
    sc = av_mallocz(sizeof(MOVStreamContext));
    if (!sc) return AVERROR(ENOMEM);

    st->priv_data = sc;
    st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
    sc->ffindex = st->index;
    c->trak_index = st->index;

    if ((ret = mov_read_default(c, pb, atom)) < 0)
        return ret;

    c->trak_index = -1;

    // Here stsc refers to a chunk not described in stco. This is technically invalid,
    // but we can overlook it (clearing stsc) whenever stts_count == 0 (indicating no samples).
    if (!sc->chunk_count && !sc->stts_count && sc->stsc_count) {
        sc->stsc_count = 0;
        av_freep(&sc->stsc_data);
    }

    /* sanity checks */
    if ((sc->chunk_count && (!sc->stts_count || !sc->stsc_count ||
                            (!sc->sample_size && !sc->sample_count))) ||
        (!sc->chunk_count && sc->sample_count)) {
        av_log(c->fc, AV_LOG_ERROR, "stream %d, missing mandatory atoms, broken header\n",
               st->index);
        return 0;
    }
    if (sc->stsc_count && sc->stsc_data[ sc->stsc_count - 1 ].first > sc->chunk_count) {
        av_log(c->fc, AV_LOG_ERROR, "stream %d, contradictionary STSC and STCO\n",
               st->index);
        return AVERROR_INVALIDDATA;
    }

    fix_timescale(c, sc);

    avpriv_set_pts_info(st, 64, 1, sc->time_scale);

    mov_build_index(c, st);

    if (sc->dref_id-1 < sc->drefs_count && sc->drefs[sc->dref_id-1].path) {
        MOVDref *dref = &sc->drefs[sc->dref_id - 1];
        if (c->enable_drefs) {
            if (mov_open_dref(c, &sc->pb, c->fc->url, dref) < 0)
                av_log(c->fc, AV_LOG_ERROR,
                       "stream %d, error opening alias: path='%s', dir='%s', "
                       "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d\n",
                       st->index, dref->path, dref->dir, dref->filename,
                       dref->volume, dref->nlvl_from, dref->nlvl_to);
        } else {
            av_log(c->fc, AV_LOG_WARNING,
                   "Skipped opening external track: "
                   "stream %d, alias: path='%s', dir='%s', "
                   "filename='%s', volume='%s', nlvl_from=%d, nlvl_to=%d."
                   "Set enable_drefs to allow this.\n",
                   st->index, dref->path, dref->dir, dref->filename,
                   dref->volume, dref->nlvl_from, dref->nlvl_to);
        }
    } else {
        sc->pb = c->fc->pb;
        sc->pb_is_copied = 1;
    }

    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
        if (!st->sample_aspect_ratio.num && st->codecpar->width && st->codecpar->height &&
            sc->height && sc->width &&
            (st->codecpar->width != sc->width || st->codecpar->height != sc->height)) {
            st->sample_aspect_ratio = av_d2q(((double)st->codecpar->height * sc->width) /
                                             ((double)st->codecpar->width * sc->height), INT_MAX);
        }

#if FF_API_R_FRAME_RATE
        if (sc->stts_count == 1 || (sc->stts_count == 2 && sc->stts_data[1].count == 1))
            av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,
                      sc->time_scale, sc->stts_data[0].duration, INT_MAX);
#endif
    }

    // done for ai5q, ai52, ai55, ai1q, ai12 and ai15.
    if (!st->codecpar->extradata_size && st->codecpar->codec_id == AV_CODEC_ID_H264 &&
        TAG_IS_AVCI(st->codecpar->codec_tag)) {
        ret = ff_generate_avci_extradata(st);
        if (ret < 0)
            return ret;
    }

    switch (st->codecpar->codec_id) {
#if CONFIG_H261_DECODER
    case AV_CODEC_ID_H261:
#endif
#if CONFIG_H263_DECODER
    case AV_CODEC_ID_H263:
#endif
#if CONFIG_MPEG4_DECODER
    case AV_CODEC_ID_MPEG4:
#endif
        st->codecpar->width = 0; /* let decoder init width/height */
        st->codecpar->height= 0;
        break;
    }

    // If the duration of the mp3 packets is not constant, then they could need a parser
    if (st->codecpar->codec_id == AV_CODEC_ID_MP3
        && sc->stts_count > 3
        && sc->stts_count*10 > st->nb_frames
        && sc->time_scale == st->codecpar->sample_rate) {
            ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
    }
    /* Do not need those anymore. */
    av_freep(&sc->chunk_offsets);
    av_freep(&sc->sample_sizes);
    av_freep(&sc->keyframes);
    av_freep(&sc->stts_data);
    av_freep(&sc->stps_data);
    av_freep(&sc->elst_data);
    av_freep(&sc->rap_group);
    av_freep(&sc->sync_group);
    av_freep(&sc->sgpd_sync);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    uint32_t type;
    uint32_t ctype;
    int64_t title_size;
    char *title_str;
    int ret;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    /* component type */
    ctype = avio_rl32(pb);
    type = avio_rl32(pb); /* component subtype */

    av_log(c->fc, AV_LOG_TRACE, "ctype=%s\n", av_fourcc2str(ctype));
    av_log(c->fc, AV_LOG_TRACE, "stype=%s\n", av_fourcc2str(type));

    if (c->trak_index < 0) {  // meta not inside a trak
        if (type == MKTAG('m','d','t','a')) {
            c->found_hdlr_mdta = 1;
        }
        return 0;
    }

    st = c->fc->streams[c->fc->nb_streams-1];

    if     (type == MKTAG('v','i','d','e'))
        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
    else if (type == MKTAG('s','o','u','n'))
        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
    else if (type == MKTAG('m','1','a',' '))
        st->codecpar->codec_id = AV_CODEC_ID_MP2;
    else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
        st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;

    avio_rb32(pb); /* component  manufacture */
    avio_rb32(pb); /* component flags */
    avio_rb32(pb); /* component flags mask */

    title_size = atom.size - 24;
    if (title_size > 0) {
        if (title_size > FFMIN(INT_MAX, SIZE_MAX-1))
            return AVERROR_INVALIDDATA;
        title_str = av_malloc(title_size + 1); /* Add null terminator */
        if (!title_str)
            return AVERROR(ENOMEM);

        ret = ffio_read_size(pb, title_str, title_size);
        if (ret < 0) {
            av_freep(&title_str);
            return ret;
        }
        title_str[title_size] = 0;
        if (title_str[0]) {
            int off = (!c->isom && title_str[0] == title_size - 1);
            // flag added so as to not set stream handler name if already set from mdia->hdlr
            av_dict_set(&st->metadata, "handler_name", title_str + off, AV_DICT_DONT_OVERWRITE);
        }
        av_freep(&title_str);
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_ares(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    if (c->fc->nb_streams >= 1) {
        AVStream *const  st = c->fc->streams[c->fc->nb_streams - 1];
        FFStream *const sti = ffstream(st);
        AVCodecParameters *par = st->codecpar;

        if (par->codec_tag == MKTAG('A', 'V', 'i', 'n') &&
            par->codec_id == AV_CODEC_ID_H264 &&
            atom.size > 11) {
            int cid;
            avio_skip(pb, 10);
            cid = avio_rb16(pb);
            /* For AVID AVCI50, force width of 1440 to be able to select the correct SPS and PPS */
            if (cid == 0xd4d || cid == 0xd4e)
                par->width = 1440;
            return 0;
        } else if ((par->codec_tag == MKTAG('A', 'V', 'd', '1') ||
                    par->codec_tag == MKTAG('A', 'V', 'j', '2') ||
                    par->codec_tag == MKTAG('A', 'V', 'd', 'n')) &&
                   atom.size >= 24) {
            int num, den;
            avio_skip(pb, 12);
            num = avio_rb32(pb);
            den = avio_rb32(pb);
            if (num <= 0 || den <= 0)
                return 0;
            switch (avio_rb32(pb)) {
            case 2:
                if (den >= INT_MAX / 2)
                    return 0;
                den *= 2;
            case 1:
                sti->display_aspect_ratio = (AVRational){ num, den };
            default:
                return 0;
            }
        }
    }

    return mov_read_avid(c, pb, atom);
}

Project: FFmpeg
File: mov.c

static int mov_read_sbgp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries;
    uint8_t version;
    uint32_t grouping_type;
    MOVSbgp *table, **tablep;
    int *table_count;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    version = avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */
    grouping_type = avio_rl32(pb);

    if (grouping_type == MKTAG('r','a','p',' ')) {
        tablep = &sc->rap_group;
        table_count = &sc->rap_group_count;
    } else if (grouping_type == MKTAG('s','y','n','c')) {
        tablep = &sc->sync_group;
        table_count = &sc->sync_group_count;
    } else {
        return 0;
    }

    if (version == 1)
        avio_rb32(pb); /* grouping_type_parameter */

    entries = avio_rb32(pb);
    if (!entries)
        return 0;
    if (*tablep)
        av_log(c->fc, AV_LOG_WARNING, "Duplicated SBGP %s atom\n", av_fourcc2str(grouping_type));
    av_freep(tablep);
    table = av_malloc_array(entries, sizeof(*table));
    if (!table)
        return AVERROR(ENOMEM);
    *tablep = table;

    for (i = 0; i < entries && !pb->eof_reached; i++) {
        table[i].count = avio_rb32(pb); /* sample_count */
        table[i].index = avio_rb32(pb); /* group_description_index */
    }

    *table_count = i;

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted SBGP atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_dmlp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    unsigned format_info;
    int channel_assignment, channel_assignment1, channel_assignment2;
    int ratebits;
    uint64_t chmask;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if (atom.size < 10)
        return AVERROR_INVALIDDATA;

    format_info = avio_rb32(pb);

    ratebits            = (format_info >> 28) & 0xF;
    channel_assignment1 = (format_info >> 15) & 0x1F;
    channel_assignment2 = format_info & 0x1FFF;
    if (channel_assignment2)
        channel_assignment = channel_assignment2;
    else
        channel_assignment = channel_assignment1;

    st->codecpar->frame_size = 40 << (ratebits & 0x7);
    st->codecpar->sample_rate = mlp_samplerate(ratebits);

    av_channel_layout_uninit(&st->codecpar->ch_layout);
    chmask = truehd_layout(channel_assignment);
    av_channel_layout_from_mask(&st->codecpar->ch_layout, chmask);

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_saiz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVEncryptionIndex *encryption_index;
    MOVStreamContext *sc;
    int ret;
    unsigned int sample_count, aux_info_type, aux_info_param;

    ret = get_current_encryption_info(c, &encryption_index, &sc);
    if (ret != 1)
        return ret;

    if (encryption_index->nb_encrypted_samples) {
        // This can happen if we have both saio/saiz and senc atoms.
        av_log(c->fc, AV_LOG_DEBUG, "Ignoring duplicate encryption info in saiz\n");
        return 0;
    }

    if (encryption_index->auxiliary_info_sample_count) {
        av_log(c->fc, AV_LOG_ERROR, "Duplicate saiz atom\n");
        return AVERROR_INVALIDDATA;
    }

    avio_r8(pb); /* version */
    if (avio_rb24(pb) & 0x01) {  /* flags */
        aux_info_type = avio_rb32(pb);
        aux_info_param = avio_rb32(pb);
        if (sc->cenc.default_encrypted_sample) {
            if (aux_info_type != sc->cenc.default_encrypted_sample->scheme) {
                av_log(c->fc, AV_LOG_DEBUG, "Ignoring saiz box with non-zero aux_info_type\n");
                return 0;
            }
            if (aux_info_param != 0) {
                av_log(c->fc, AV_LOG_DEBUG, "Ignoring saiz box with non-zero aux_info_type_parameter\n");
                return 0;
            }
        } else {
            // Didn't see 'schm' or 'tenc', so this isn't encrypted.
            if ((aux_info_type == MKBETAG('c','e','n','c') ||
                 aux_info_type == MKBETAG('c','e','n','s') ||
                 aux_info_type == MKBETAG('c','b','c','1') ||
                 aux_info_type == MKBETAG('c','b','c','s')) &&
                aux_info_param == 0) {
                av_log(c->fc, AV_LOG_ERROR, "Saw encrypted saiz without schm/tenc\n");
                return AVERROR_INVALIDDATA;
            } else {
                return 0;
            }
        }
    } else if (!sc->cenc.default_encrypted_sample) {
        // Didn't see 'schm' or 'tenc', so this isn't encrypted.
        return 0;
    }

    encryption_index->auxiliary_info_default_size = avio_r8(pb);
    sample_count = avio_rb32(pb);
    encryption_index->auxiliary_info_sample_count = sample_count;

    if (encryption_index->auxiliary_info_default_size == 0) {
        ret = mov_try_read_block(pb, sample_count, &encryption_index->auxiliary_info_sizes);
        if (ret < 0) {
            av_log(c->fc, AV_LOG_ERROR, "Failed to read the auxiliary info\n");
            return ret;
        }
    }

    if (encryption_index->auxiliary_offsets_count) {
        return mov_parse_auxiliary_info(c, sc, pb, encryption_index);
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_mdcv(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVStreamContext *sc;
    const int mapping[3] = {1, 2, 0};
    const int chroma_den = 50000;
    const int luma_den = 10000;
    int i;

    if (c->fc->nb_streams < 1)
        return AVERROR_INVALIDDATA;

    sc = c->fc->streams[c->fc->nb_streams - 1]->priv_data;

    if (atom.size < 24 || sc->mastering) {
        av_log(c->fc, AV_LOG_ERROR, "Invalid Mastering Display Color Volume box\n");
        return AVERROR_INVALIDDATA;
    }

    sc->mastering = av_mastering_display_metadata_alloc();
    if (!sc->mastering)
        return AVERROR(ENOMEM);

    for (i = 0; i < 3; i++) {
        const int j = mapping[i];
        sc->mastering->display_primaries[j][0] = av_make_q(avio_rb16(pb), chroma_den);
        sc->mastering->display_primaries[j][1] = av_make_q(avio_rb16(pb), chroma_den);
    }
    sc->mastering->white_point[0] = av_make_q(avio_rb16(pb), chroma_den);
    sc->mastering->white_point[1] = av_make_q(avio_rb16(pb), chroma_den);

    sc->mastering->max_luminance = av_make_q(avio_rb32(pb), luma_den);
    sc->mastering->min_luminance = av_make_q(avio_rb32(pb), luma_den);

    sc->mastering->has_luminance = 1;
    sc->mastering->has_primaries = 1;

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_uuid(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    int64_t ret;
    AVUUID uuid;
    static const AVUUID uuid_isml_manifest = {
        0xa5, 0xd4, 0x0b, 0x30, 0xe8, 0x14, 0x11, 0xdd,
        0xba, 0x2f, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66
    };
    static const AVUUID uuid_xmp = {
        0xbe, 0x7a, 0xcf, 0xcb, 0x97, 0xa9, 0x42, 0xe8,
        0x9c, 0x71, 0x99, 0x94, 0x91, 0xe3, 0xaf, 0xac
    };
    static const AVUUID uuid_spherical = {
        0xff, 0xcc, 0x82, 0x63, 0xf8, 0x55, 0x4a, 0x93,
        0x88, 0x14, 0x58, 0x7a, 0x02, 0x52, 0x1f, 0xdd,
    };

    if (atom.size < AV_UUID_LEN || atom.size >= FFMIN(INT_MAX, SIZE_MAX))
        return AVERROR_INVALIDDATA;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams - 1];
    sc = st->priv_data;

    ret = ffio_read_size(pb, uuid, AV_UUID_LEN);
    if (ret < 0)
        return ret;
    if (av_uuid_equal(uuid, uuid_isml_manifest)) {
        uint8_t *buffer, *ptr;
        char *endptr;
        size_t len = atom.size - AV_UUID_LEN;

        if (len < 4) {
            return AVERROR_INVALIDDATA;
        }
        ret = avio_skip(pb, 4); // zeroes
        len -= 4;

        buffer = av_mallocz(len + 1);
        if (!buffer) {
            return AVERROR(ENOMEM);
        }
        ret = ffio_read_size(pb, buffer, len);
        if (ret < 0) {
            av_free(buffer);
            return ret;
        }

        ptr = buffer;
        while ((ptr = av_stristr(ptr, "systemBitrate=\""))) {
            ptr += sizeof("systemBitrate=\"") - 1;
            c->bitrates_count++;
            c->bitrates = av_realloc_f(c->bitrates, c->bitrates_count, sizeof(*c->bitrates));
            if (!c->bitrates) {
                c->bitrates_count = 0;
                av_free(buffer);
                return AVERROR(ENOMEM);
            }
            errno = 0;
            ret = strtol(ptr, &endptr, 10);
            if (ret < 0 || errno || *endptr != '"') {
                c->bitrates[c->bitrates_count - 1] = 0;
            } else {
                c->bitrates[c->bitrates_count - 1] = ret;
            }
        }

        av_free(buffer);
    } else if (av_uuid_equal(uuid, uuid_xmp)) {
        uint8_t *buffer;
        size_t len = atom.size - AV_UUID_LEN;
        if (c->export_xmp) {
            buffer = av_mallocz(len + 1);
            if (!buffer) {
                return AVERROR(ENOMEM);
            }
            ret = ffio_read_size(pb, buffer, len);
            if (ret < 0) {
                av_free(buffer);
                return ret;
            }
            buffer[len] = '\0';
            av_dict_set(&c->fc->metadata, "xmp",
                        buffer, AV_DICT_DONT_STRDUP_VAL);
        } else {
            // skip all uuid atom, which makes it fast for long uuid-xmp file
            ret = avio_skip(pb, len);
            if (ret < 0)
                return ret;
        }
    } else if (av_uuid_equal(uuid, uuid_spherical)) {
        size_t len = atom.size - AV_UUID_LEN;
        ret = mov_parse_uuid_spherical(sc, pb, len);
        if (ret < 0)
            return ret;
        if (!sc->spherical)
            av_log(c->fc, AV_LOG_WARNING, "Invalid spherical metadata found\n");
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_dfla(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    int last, type, size, ret;
    uint8_t buf[4];

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if ((uint64_t)atom.size > (1<<30) || atom.size < 42)
        return AVERROR_INVALIDDATA;

    /* Check FlacSpecificBox version. */
    if (avio_r8(pb) != 0)
        return AVERROR_INVALIDDATA;

    avio_rb24(pb); /* Flags */

    if (avio_read(pb, buf, sizeof(buf)) != sizeof(buf)) {
        av_log(c->fc, AV_LOG_ERROR, "failed to read FLAC metadata block header\n");
        return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA;
    }
    flac_parse_block_header(buf, &last, &type, &size);

    if (type != FLAC_METADATA_TYPE_STREAMINFO || size != FLAC_STREAMINFO_SIZE) {
        av_log(c->fc, AV_LOG_ERROR, "STREAMINFO must be first FLACMetadataBlock\n");
        return AVERROR_INVALIDDATA;
    }

    ret = ff_get_extradata(c->fc, st->codecpar, pb, size);
    if (ret < 0)
        return ret;

    if (!last)
        av_log(c->fc, AV_LOG_WARNING, "non-STREAMINFO FLACMetadataBlock(s) ignored\n");

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_stss(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    FFStream *sti;
    MOVStreamContext *sc;
    unsigned int i, entries;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sti = ffstream(st);
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    entries = avio_rb32(pb);

    av_log(c->fc, AV_LOG_TRACE, "keyframe_count = %u\n", entries);

    if (!entries) {
        sc->keyframe_absent = 1;
        if (!sti->need_parsing && st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
            sti->need_parsing = AVSTREAM_PARSE_HEADERS;
        return 0;
    }
    if (sc->keyframes)
        av_log(c->fc, AV_LOG_WARNING, "Duplicated STSS atom\n");
    if (entries >= UINT_MAX / sizeof(int))
        return AVERROR_INVALIDDATA;
    av_freep(&sc->keyframes);
    sc->keyframe_count = 0;
    sc->keyframes = av_malloc_array(entries, sizeof(*sc->keyframes));
    if (!sc->keyframes)
        return AVERROR(ENOMEM);

    for (i = 0; i < entries && !pb->eof_reached; i++) {
        sc->keyframes[i] = avio_rb32(pb);
    }

    sc->keyframe_count = i;

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STSS atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_dvcc_dvvc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    uint8_t buf[ISOM_DVCC_DVVC_SIZE];
    int ret;
    int64_t read_size = atom.size;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    // At most 24 bytes
    read_size = FFMIN(read_size, ISOM_DVCC_DVVC_SIZE);

    if ((ret = ffio_read_size(pb, buf, read_size)) < 0)
        return ret;

    return ff_isom_parse_dvcc_dvvc(c->fc, st, buf, read_size);
}

Project: FFmpeg
File: mov.c

static int parse_timecode_in_framenum_format(AVFormatContext *s, AVStream *st,
                                             int64_t value, int flags)
{
    AVTimecode tc;
    char buf[AV_TIMECODE_STR_SIZE];
    AVRational rate = st->avg_frame_rate;
    int ret = av_timecode_init(&tc, rate, flags, 0, s);
    if (ret < 0)
        return ret;
    av_dict_set(&st->metadata, "timecode",
                av_timecode_make_string(&tc, buf, value), 0);
    return 0;
}

Project: FFmpeg
File: mov.c

static void set_frag_stream(MOVFragmentIndex *frag_index, int id)
{
    int i;
    MOVFragmentIndexItem * item;

    if (frag_index->current < 0 ||
        frag_index->current >= frag_index->nb_items)
        return;

    item = &frag_index->item[frag_index->current];
    for (i = 0; i < item->nb_stream_info; i++)
        if (item->stream_info[i].id == id) {
            item->current = i;
            return;
        }

    // id not found.  This shouldn't happen.
    item->current = -1;
}

Project: FFmpeg
File: mov.c

static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    entries = avio_rb32(pb);
    if ((uint64_t)entries * 12 + 4 > atom.size)
        return AVERROR_INVALIDDATA;

    av_log(c->fc, AV_LOG_TRACE, "track[%u].stsc.entries = %u\n", c->fc->nb_streams - 1, entries);

    if (!entries)
        return 0;
    if (sc->stsc_data) {
        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicated STSC atom\n");
        return 0;
    }
    av_free(sc->stsc_data);
    sc->stsc_count = 0;
    sc->stsc_data = av_malloc_array(entries, sizeof(*sc->stsc_data));
    if (!sc->stsc_data)
        return AVERROR(ENOMEM);

    for (i = 0; i < entries && !pb->eof_reached; i++) {
        sc->stsc_data[i].first = avio_rb32(pb);
        sc->stsc_data[i].count = avio_rb32(pb);
        sc->stsc_data[i].id = avio_rb32(pb);
    }

    sc->stsc_count = i;
    for (i = sc->stsc_count - 1; i < UINT_MAX; i--) {
        int64_t first_min = i + 1;
        if ((i+1 < sc->stsc_count && sc->stsc_data[i].first >= sc->stsc_data[i+1].first) ||
            (i > 0 && sc->stsc_data[i].first <= sc->stsc_data[i-1].first) ||
            sc->stsc_data[i].first < first_min ||
            sc->stsc_data[i].count < 1 ||
            sc->stsc_data[i].id < 1) {
            av_log(c->fc, AV_LOG_WARNING, "STSC entry %d is invalid (first=%d count=%d id=%d)\n", i, sc->stsc_data[i].first, sc->stsc_data[i].count, sc->stsc_data[i].id);
            if (i+1 >= sc->stsc_count) {
                if (sc->stsc_data[i].count == 0 && i > 0) {
                    sc->stsc_count --;
                    continue;
                }
                sc->stsc_data[i].first = FFMAX(sc->stsc_data[i].first, first_min);
                if (i > 0 && sc->stsc_data[i].first <= sc->stsc_data[i-1].first)
                    sc->stsc_data[i].first = FFMIN(sc->stsc_data[i-1].first + 1LL, INT_MAX);
                sc->stsc_data[i].count = FFMAX(sc->stsc_data[i].count, 1);
                sc->stsc_data[i].id    = FFMAX(sc->stsc_data[i].id, 1);
                continue;
            }
            av_assert0(sc->stsc_data[i+1].first >= 2);
            // We replace this entry by the next valid
            sc->stsc_data[i].first = sc->stsc_data[i+1].first - 1;
            sc->stsc_data[i].count = sc->stsc_data[i+1].count;
            sc->stsc_data[i].id    = sc->stsc_data[i+1].id;
        }
    }

    if (pb->eof_reached) {
        av_log(c->fc, AV_LOG_WARNING, "reached eof, corrupted STSC atom\n");
        return AVERROR_EOF;
    }

    return 0;
}

Project: FFmpeg
File: mov.c

static MOVFragmentStreamInfo *get_frag_stream_info_from_pkt(MOVFragmentIndex *frag_index, AVPacket *pkt, int id)
{
    int current = frag_index->current;

    if (!frag_index->nb_items)
        return NULL;

    // Check frag_index->current is the right one for pkt. It can out of sync.
    if (current >= 0 && current < frag_index->nb_items) {
        if (frag_index->item[current].moof_offset < pkt->pos &&
            (current + 1 == frag_index->nb_items ||
             frag_index->item[current + 1].moof_offset > pkt->pos))
            return get_frag_stream_info(frag_index, current, id);
    }


    for (int i = 0; i < frag_index->nb_items; i++) {
        if (frag_index->item[i].moof_offset > pkt->pos)
            break;
        current = i;
    }
    frag_index->current = current;
    return get_frag_stream_info(frag_index, current, id);
}

Project: FFmpeg
File: mov.c

static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
{
    MOVStreamContext *sc = st->priv_data;
    FFStream *const sti = ffstream(st);
    int sample, time_sample, ret;
    unsigned int i;

    // Here we consider timestamp to be PTS, hence try to offset it so that we
    // can search over the DTS timeline.
    timestamp -= (sc->min_corrected_pts + sc->dts_shift);

    ret = mov_seek_fragment(s, st, timestamp);
    if (ret < 0)
        return ret;

    for (;;) {
        sample = av_index_search_timestamp(st, timestamp, flags);
        av_log(s, AV_LOG_TRACE, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
        if (sample < 0 && sti->nb_index_entries && timestamp < sti->index_entries[0].timestamp)
            sample = 0;
        if (sample < 0) /* not sure what to do */
            return AVERROR_INVALIDDATA;

        if (!sample || can_seek_to_key_sample(st, sample, timestamp))
            break;
        timestamp -= FFMAX(sc->min_sample_duration, 1);
    }

    mov_current_sample_set(sc, sample);
    av_log(s, AV_LOG_TRACE, "stream %d, found sample %d\n", st->index, sc->current_sample);
    /* adjust ctts index */
    if (sc->ctts_data) {
        time_sample = 0;
        for (i = 0; i < sc->ctts_count; i++) {
            int next = time_sample + sc->ctts_data[i].count;
            if (next > sc->current_sample) {
                sc->ctts_index = i;
                sc->ctts_sample = sc->current_sample - time_sample;
                break;
            }
            time_sample = next;
        }
    }

    /* adjust stsd index */
    if (sc->chunk_count) {
        time_sample = 0;
        for (i = 0; i < sc->stsc_count; i++) {
            int64_t next = time_sample + mov_get_stsc_samples(sc, i);
            if (next > sc->current_sample) {
                sc->stsc_index = i;
                sc->stsc_sample = sc->current_sample - time_sample;
                break;
            }
            av_assert0(next == (int)next);
            time_sample = next;
        }
    }

    return sample;
}

Project: FFmpeg
File: mov.c

static int mov_read_dops(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    const int OPUS_SEEK_PREROLL_MS = 80;
    int ret;
    AVStream *st;
    size_t size;
    uint16_t pre_skip;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];

    if ((uint64_t)atom.size > (1<<30) || atom.size < 11)
        return AVERROR_INVALIDDATA;

    /* Check OpusSpecificBox version. */
    if (avio_r8(pb) != 0) {
        av_log(c->fc, AV_LOG_ERROR, "unsupported OpusSpecificBox version\n");
        return AVERROR_INVALIDDATA;
    }

    /* OpusSpecificBox size plus magic for Ogg OpusHead header. */
    size = atom.size + 8;

    if ((ret = ff_alloc_extradata(st->codecpar, size)) < 0)
        return ret;

    AV_WL32(st->codecpar->extradata, MKTAG('O','p','u','s'));
    AV_WL32(st->codecpar->extradata + 4, MKTAG('H','e','a','d'));
    AV_WB8(st->codecpar->extradata + 8, 1); /* OpusHead version */
    avio_read(pb, st->codecpar->extradata + 9, size - 9);

    /* OpusSpecificBox is stored in big-endian, but OpusHead is
       little-endian; aside from the preceeding magic and version they're
       otherwise currently identical.  Data after output gain at offset 16
       doesn't need to be bytewapped. */
    pre_skip = AV_RB16(st->codecpar->extradata + 10);
    AV_WL16(st->codecpar->extradata + 10, pre_skip);
    AV_WL32(st->codecpar->extradata + 12, AV_RB32(st->codecpar->extradata + 12));
    AV_WL16(st->codecpar->extradata + 16, AV_RB16(st->codecpar->extradata + 16));

    st->codecpar->initial_padding = pre_skip;
    st->codecpar->seek_preroll = av_rescale_q(OPUS_SEEK_PREROLL_MS,
                                              (AVRational){1, 1000},
                                              (AVRational){1, 48000});

    return 0;
}

Project: FFmpeg
File: mov.c

static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    MOVStreamContext *sc;
    int i, edit_count, version;
    int64_t elst_entry_size;

    if (c->fc->nb_streams < 1 || c->ignore_editlist)
        return 0;
    sc = c->fc->streams[c->fc->nb_streams-1]->priv_data;

    version = avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */
    edit_count = avio_rb32(pb); /* entries */
    atom.size -= 8;

    elst_entry_size = version == 1 ? 20 : 12;
    if (atom.size != edit_count * elst_entry_size) {
        if (c->fc->strict_std_compliance >= FF_COMPLIANCE_STRICT) {
            av_log(c->fc, AV_LOG_ERROR, "Invalid edit list entry_count: %d for elst atom of size: %"PRId64" bytes.\n",
                   edit_count, atom.size + 8);
            return AVERROR_INVALIDDATA;
        } else {
            edit_count = atom.size / elst_entry_size;
            if (edit_count * elst_entry_size != atom.size) {
                av_log(c->fc, AV_LOG_WARNING, "ELST atom of %"PRId64" bytes, bigger than %d entries.\n", atom.size, edit_count);
            }
        }
    }

    if (!edit_count)
        return 0;
    if (sc->elst_data)
        av_log(c->fc, AV_LOG_WARNING, "Duplicated ELST atom\n");
    av_free(sc->elst_data);
    sc->elst_count = 0;
    sc->elst_data = av_malloc_array(edit_count, sizeof(*sc->elst_data));
    if (!sc->elst_data)
        return AVERROR(ENOMEM);

    av_log(c->fc, AV_LOG_TRACE, "track[%u].edit_count = %i\n", c->fc->nb_streams - 1, edit_count);
    for (i = 0; i < edit_count && atom.size > 0 && !pb->eof_reached; i++) {
        MOVElst *e = &sc->elst_data[i];

        if (version == 1) {
            e->duration = avio_rb64(pb);
            e->time     = avio_rb64(pb);
            atom.size -= 16;
        } else {
            e->duration = avio_rb32(pb); /* segment duration */
            e->time     = (int32_t)avio_rb32(pb); /* media time */
            atom.size -= 8;
        }
        e->rate = avio_rb32(pb) / 65536.0;
        atom.size -= 4;
        av_log(c->fc, AV_LOG_TRACE, "duration=%"PRId64" time=%"PRId64" rate=%f\n",
               e->duration, e->time, e->rate);

        if (e->time < 0 && e->time != -1 &&
            c->fc->strict_std_compliance >= FF_COMPLIANCE_STRICT) {
            av_log(c->fc, AV_LOG_ERROR, "Track %d, edit %d: Invalid edit list media time=%"PRId64"\n",
                   c->fc->nb_streams-1, i, e->time);
            return AVERROR_INVALIDDATA;
        }
    }
    sc->elst_count = i;

    return 0;
}

Project: FFmpeg
File: mov.c

static void mov_fix_index(MOVContext *mov, AVStream *st)
{
    MOVStreamContext *msc = st->priv_data;
    FFStream *const sti = ffstream(st);
    AVIndexEntry *e_old = sti->index_entries;
    int nb_old = sti->nb_index_entries;
    const AVIndexEntry *e_old_end = e_old + nb_old;
    const AVIndexEntry *current = NULL;
    MOVCtts *ctts_data_old = msc->ctts_data;
    int64_t ctts_index_old = 0;
    int64_t ctts_sample_old = 0;
    int64_t ctts_count_old = msc->ctts_count;
    int64_t edit_list_media_time = 0;
    int64_t edit_list_duration = 0;
    int64_t frame_duration = 0;
    int64_t edit_list_dts_counter = 0;
    int64_t edit_list_dts_entry_end = 0;
    int64_t edit_list_start_ctts_sample = 0;
    int64_t curr_cts;
    int64_t curr_ctts = 0;
    int64_t empty_edits_sum_duration = 0;
    int64_t edit_list_index = 0;
    int64_t index;
    int flags;
    int64_t start_dts = 0;
    int64_t edit_list_start_encountered = 0;
    int64_t search_timestamp = 0;
    int64_t* frame_duration_buffer = NULL;
    int num_discarded_begin = 0;
    int first_non_zero_audio_edit = -1;
    int packet_skip_samples = 0;
    MOVIndexRange *current_index_range;
    int found_keyframe_after_edit = 0;
    int found_non_empty_edit = 0;

    if (!msc->elst_data || msc->elst_count <= 0 || nb_old <= 0) {
        return;
    }

    // allocate the index ranges array
    msc->index_ranges = av_malloc((msc->elst_count + 1) * sizeof(msc->index_ranges[0]));
    if (!msc->index_ranges) {
        av_log(mov->fc, AV_LOG_ERROR, "Cannot allocate index ranges buffer\n");
        return;
    }
    msc->current_index_range = msc->index_ranges;
    current_index_range = msc->index_ranges - 1;

    // Clean AVStream from traces of old index
    sti->index_entries = NULL;
    sti->index_entries_allocated_size = 0;
    sti->nb_index_entries = 0;

    // Clean ctts fields of MOVStreamContext
    msc->ctts_data = NULL;
    msc->ctts_count = 0;
    msc->ctts_index = 0;
    msc->ctts_sample = 0;
    msc->ctts_allocated_size = 0;

    // Reinitialize min_corrected_pts so that it can be computed again.
    msc->min_corrected_pts = -1;

    // If the dts_shift is positive (in case of negative ctts values in mov),
    // then negate the DTS by dts_shift
    if (msc->dts_shift > 0) {
        edit_list_dts_entry_end -= msc->dts_shift;
        av_log(mov->fc, AV_LOG_DEBUG, "Shifting DTS by %d because of negative CTTS.\n", msc->dts_shift);
    }

    start_dts = edit_list_dts_entry_end;

    while (get_edit_list_entry(mov, msc, edit_list_index, &edit_list_media_time,
                               &edit_list_duration, mov->time_scale)) {
        av_log(mov->fc, AV_LOG_DEBUG, "Processing st: %d, edit list %"PRId64" - media time: %"PRId64", duration: %"PRId64"\n",
               st->index, edit_list_index, edit_list_media_time, edit_list_duration);
        edit_list_index++;
        edit_list_dts_counter = edit_list_dts_entry_end;
        edit_list_dts_entry_end += edit_list_duration;
        num_discarded_begin = 0;
        if (!found_non_empty_edit && edit_list_media_time == -1) {
            empty_edits_sum_duration += edit_list_duration;
            continue;
        }
        found_non_empty_edit = 1;

        // If we encounter a non-negative edit list reset the skip_samples/start_pad fields and set them
        // according to the edit list below.
        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            if (first_non_zero_audio_edit < 0) {
                first_non_zero_audio_edit = 1;
            } else {
                first_non_zero_audio_edit = 0;
            }

            if (first_non_zero_audio_edit > 0)
                sti->skip_samples = msc->start_pad = 0;
        }

        // While reordering frame index according to edit list we must handle properly
        // the scenario when edit list entry starts from none key frame.
        // We find closest previous key frame and preserve it and consequent frames in index.
        // All frames which are outside edit list entry time boundaries will be dropped after decoding.
        search_timestamp = edit_list_media_time;
        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
            // Audio decoders like AAC need need a decoder delay samples previous to the current sample,
            // to correctly decode this frame. Hence for audio we seek to a frame 1 sec. before the
            // edit_list_media_time to cover the decoder delay.
            search_timestamp = FFMAX(search_timestamp - msc->time_scale, e_old[0].timestamp);
        }

        if (find_prev_closest_index(st, e_old, nb_old, ctts_data_old, ctts_count_old, search_timestamp, 0,
                                    &index, &ctts_index_old, &ctts_sample_old) < 0) {
            av_log(mov->fc, AV_LOG_WARNING,
                   "st: %d edit list: %"PRId64" Missing key frame while searching for timestamp: %"PRId64"\n",
                   st->index, edit_list_index, search_timestamp);
            if (find_prev_closest_index(st, e_old, nb_old, ctts_data_old, ctts_count_old, search_timestamp, AVSEEK_FLAG_ANY,
                                        &index, &ctts_index_old, &ctts_sample_old) < 0) {
                av_log(mov->fc, AV_LOG_WARNING,
                       "st: %d edit list %"PRId64" Cannot find an index entry before timestamp: %"PRId64".\n",
                       st->index, edit_list_index, search_timestamp);
                index = 0;
                ctts_index_old = 0;
                ctts_sample_old = 0;
            }
        }
        current = e_old + index;
        edit_list_start_ctts_sample = ctts_sample_old;

        // Iterate over index and arrange it according to edit list
        edit_list_start_encountered = 0;
        found_keyframe_after_edit = 0;
        for (; current < e_old_end; current++, index++) {
            // check  if frame outside edit list mark it for discard
            frame_duration = (current + 1 <  e_old_end) ?
                             ((current + 1)->timestamp - current->timestamp) : edit_list_duration;

            flags = current->flags;

            // frames (pts) before or after edit list
            curr_cts = current->timestamp + msc->dts_shift;
            curr_ctts = 0;

            if (ctts_data_old && ctts_index_old < ctts_count_old) {
                curr_ctts = ctts_data_old[ctts_index_old].duration;
                av_log(mov->fc, AV_LOG_TRACE, "stts: %"PRId64" ctts: %"PRId64", ctts_index: %"PRId64", ctts_count: %"PRId64"\n",
                       curr_cts, curr_ctts, ctts_index_old, ctts_count_old);
                curr_cts += curr_ctts;
                ctts_sample_old++;
                if (ctts_sample_old == ctts_data_old[ctts_index_old].count) {
                    if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
                                       &msc->ctts_allocated_size,
                                       ctts_data_old[ctts_index_old].count - edit_list_start_ctts_sample,
                                       ctts_data_old[ctts_index_old].duration) == -1) {
                        av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
                               ctts_index_old,
                               ctts_data_old[ctts_index_old].count - edit_list_start_ctts_sample,
                               ctts_data_old[ctts_index_old].duration);
                        break;
                    }
                    ctts_index_old++;
                    ctts_sample_old = 0;
                    edit_list_start_ctts_sample = 0;
                }
            }

            if (curr_cts < edit_list_media_time || curr_cts >= (edit_list_duration + edit_list_media_time)) {
                if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->codec_id != AV_CODEC_ID_VORBIS &&
                    curr_cts < edit_list_media_time && curr_cts + frame_duration > edit_list_media_time &&
                    first_non_zero_audio_edit > 0) {
                    packet_skip_samples = edit_list_media_time - curr_cts;
                    sti->skip_samples += packet_skip_samples;

                    // Shift the index entry timestamp by packet_skip_samples to be correct.
                    edit_list_dts_counter -= packet_skip_samples;
                    if (edit_list_start_encountered == 0)  {
                        edit_list_start_encountered = 1;
                        // Make timestamps strictly monotonically increasing for audio, by rewriting timestamps for
                        // discarded packets.
                        if (frame_duration_buffer) {
                            fix_index_entry_timestamps(st, sti->nb_index_entries, edit_list_dts_counter,
                                                       frame_duration_buffer, num_discarded_begin);
                            av_freep(&frame_duration_buffer);
                        }
                    }

                    av_log(mov->fc, AV_LOG_DEBUG, "skip %d audio samples from curr_cts: %"PRId64"\n", packet_skip_samples, curr_cts);
                } else {
                    flags |= AVINDEX_DISCARD_FRAME;
                    av_log(mov->fc, AV_LOG_DEBUG, "drop a frame at curr_cts: %"PRId64" @ %"PRId64"\n", curr_cts, index);

                    if (edit_list_start_encountered == 0) {
                        num_discarded_begin++;
                        frame_duration_buffer = av_realloc(frame_duration_buffer,
                                                           num_discarded_begin * sizeof(int64_t));
                        if (!frame_duration_buffer) {
                            av_log(mov->fc, AV_LOG_ERROR, "Cannot reallocate frame duration buffer\n");
                            break;
                        }
                        frame_duration_buffer[num_discarded_begin - 1] = frame_duration;

                        // Increment skip_samples for the first non-zero audio edit list
                        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
                            first_non_zero_audio_edit > 0 && st->codecpar->codec_id != AV_CODEC_ID_VORBIS) {
                            sti->skip_samples += frame_duration;
                        }
                    }
                }
            } else {
                if (msc->min_corrected_pts < 0) {
                    msc->min_corrected_pts = edit_list_dts_counter + curr_ctts + msc->dts_shift;
                } else {
                    msc->min_corrected_pts = FFMIN(msc->min_corrected_pts, edit_list_dts_counter + curr_ctts + msc->dts_shift);
                }
                if (edit_list_start_encountered == 0) {
                    edit_list_start_encountered = 1;
                    // Make timestamps strictly monotonically increasing by rewriting timestamps for
                    // discarded packets.
                    if (frame_duration_buffer) {
                        fix_index_entry_timestamps(st, sti->nb_index_entries, edit_list_dts_counter,
                                                   frame_duration_buffer, num_discarded_begin);
                        av_freep(&frame_duration_buffer);
                    }
                }
            }

            if (add_index_entry(st, current->pos, edit_list_dts_counter, current->size,
                                current->min_distance, flags) == -1) {
                av_log(mov->fc, AV_LOG_ERROR, "Cannot add index entry\n");
                break;
            }

            // Update the index ranges array
            if (current_index_range < msc->index_ranges || index != current_index_range->end) {
                current_index_range++;
                current_index_range->start = index;
            }
            current_index_range->end = index + 1;

            // Only start incrementing DTS in frame_duration amounts, when we encounter a frame in edit list.
            if (edit_list_start_encountered > 0) {
                edit_list_dts_counter = edit_list_dts_counter + frame_duration;
            }

            // Break when found first key frame after edit entry completion
            if ((curr_cts + frame_duration >= (edit_list_duration + edit_list_media_time)) &&
                ((flags & AVINDEX_KEYFRAME) || ((st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)))) {
                if (ctts_data_old) {
                    // If we have CTTS and this is the first keyframe after edit elist,
                    // wait for one more, because there might be trailing B-frames after this I-frame
                    // that do belong to the edit.
                    if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO && found_keyframe_after_edit == 0) {
                        found_keyframe_after_edit = 1;
                        continue;
                    }
                    if (ctts_sample_old != 0) {
                        if (add_ctts_entry(&msc->ctts_data, &msc->ctts_count,
                                           &msc->ctts_allocated_size,
                                           ctts_sample_old - edit_list_start_ctts_sample,
                                           ctts_data_old[ctts_index_old].duration) == -1) {
                            av_log(mov->fc, AV_LOG_ERROR, "Cannot add CTTS entry %"PRId64" - {%"PRId64", %d}\n",
                                   ctts_index_old, ctts_sample_old - edit_list_start_ctts_sample,
                                   ctts_data_old[ctts_index_old].duration);
                            break;
                        }
                    }
                }
                break;
            }
        }
    }
    // If there are empty edits, then msc->min_corrected_pts might be positive
    // intentionally. So we subtract the sum duration of emtpy edits here.
    msc->min_corrected_pts -= empty_edits_sum_duration;

    // If the minimum pts turns out to be greater than zero after fixing the index, then we subtract the
    // dts by that amount to make the first pts zero.
    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
        if (msc->min_corrected_pts > 0) {
            av_log(mov->fc, AV_LOG_DEBUG, "Offset DTS by %"PRId64" to make first pts zero.\n", msc->min_corrected_pts);
            for (int i = 0; i < sti->nb_index_entries; ++i)
                sti->index_entries[i].timestamp -= msc->min_corrected_pts;
        }
    }
    // Start time should be equal to zero or the duration of any empty edits.
    st->start_time = empty_edits_sum_duration;

    // Update av stream length, if it ends up shorter than the track's media duration
    st->duration = FFMIN(st->duration, edit_list_dts_entry_end - start_dts);
    msc->start_pad = sti->skip_samples;

    // Free the old index and the old CTTS structures
    av_free(e_old);
    av_free(ctts_data_old);
    av_freep(&frame_duration_buffer);

    // Null terminate the index ranges array
    current_index_range++;
    current_index_range->start = 0;
    current_index_range->end = 0;
    msc->current_index = msc->index_ranges[0].start;
}